diff --git a/coders/aai.c b/coders/aai.c
index 5cf8dcb..3ae10a9 100644
--- a/coders/aai.c
+++ b/coders/aai.c
@@ -182,7 +182,7 @@
           *p=255;
         SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
         if (GetPixelAlpha(image,q) != OpaqueAlpha)
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
         q+=GetPixelChannels(image);
       }
       if (SyncAuthenticPixels(image,exception) == MagickFalse)
@@ -389,7 +389,7 @@
         *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
         *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
         *q++=ScaleQuantumToChar(GetPixelRed(image,p));
-        *q=ScaleQuantumToChar((Quantum) (image->matte != MagickFalse ?
+        *q=ScaleQuantumToChar((Quantum) (image->alpha_trait == BlendPixelTrait ?
           GetPixelAlpha(image,p) : OpaqueAlpha));
         if (*q == 255)
           *q=254;
diff --git a/coders/avs.c b/coders/avs.c
index 0cf6d42..1f4d4fc 100644
--- a/coders/avs.c
+++ b/coders/avs.c
@@ -141,7 +141,7 @@
   /*
     Read AVS X image.
   */
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   width=ReadBlobMSBLong(image);
   height=ReadBlobMSBLong(image);
   if (EOFBlob(image) != MagickFalse)
@@ -382,7 +382,7 @@
       q=pixels;
       for (x=0; x < (ssize_t) image->columns; x++)
       {
-        *q++=ScaleQuantumToChar((Quantum) (image->matte != MagickFalse ?
+        *q++=ScaleQuantumToChar((Quantum) (image->alpha_trait == BlendPixelTrait ?
           GetPixelAlpha(image,p) : OpaqueAlpha));
         *q++=ScaleQuantumToChar(GetPixelRed(image,p));
         *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
diff --git a/coders/bgr.c b/coders/bgr.c
index 7c4cb84..a800ff2 100644
--- a/coders/bgr.c
+++ b/coders/bgr.c
@@ -168,7 +168,7 @@
   if (LocaleCompare(image_info->magick,"BGRA") == 0)
     {
       quantum_type=BGRAQuantum;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
     }
   if (image_info->number_scenes != 0)
     while (image->scene < image_info->scene)
@@ -250,7 +250,7 @@
                 SetPixelGreen(image,GetPixelGreen(canvas_image,p),q);
                 SetPixelBlue(image,GetPixelBlue(canvas_image,p),q);
                 SetPixelAlpha(image,OpaqueAlpha,q);
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                   SetPixelAlpha(image,GetPixelAlpha(canvas_image,p),q);
                 p+=GetPixelChannels(canvas_image);
                 q+=GetPixelChannels(image);
@@ -305,7 +305,7 @@
                 "UnexpectedEndOfFile",image->filename);
               break;
             }
-          for (i=0; i < (ssize_t) (image->matte != MagickFalse ? 4 : 3); i++)
+          for (i=0; i < (ssize_t) (image->alpha_trait == BlendPixelTrait ? 4 : 3); i++)
           {
             quantum_type=quantum_types[i];
             q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,
@@ -548,7 +548,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             for (y=0; y < (ssize_t) image->extract_info.height; y++)
             {
@@ -832,7 +832,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             (void) CloseBlob(image);
             AppendImageFormat("A",image->filename);
@@ -1097,7 +1097,7 @@
   if (LocaleCompare(image_info->magick,"BGRA") == 0)
     {
       quantum_type=BGRAQuantum;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
     }
   scene=0;
   do
@@ -1108,7 +1108,7 @@
     if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
       (void) TransformImageColorspace(image,sRGBColorspace,exception);
     if ((LocaleCompare(image_info->magick,"BGRA") == 0) &&
-        (image->matte == MagickFalse))
+        (image->alpha_trait != BlendPixelTrait))
       (void) SetImageAlphaChannel(image,OpaqueAlphaChannel,exception);
     quantum_info=AcquireQuantumInfo(image_info,image);
     if (quantum_info == (QuantumInfo *) NULL)
diff --git a/coders/bmp.c b/coders/bmp.c
index 4cc7eb6..a99115b 100644
--- a/coders/bmp.c
+++ b/coders/bmp.c
@@ -841,7 +841,7 @@
     image->rows=(size_t) MagickAbsoluteValue(bmp_info.height);
     image->depth=bmp_info.bits_per_pixel <= 8 ? bmp_info.bits_per_pixel : 8;
     if ((bmp_info.bits_per_pixel == 16) || (bmp_info.bits_per_pixel == 32))
-      image->matte=bmp_info.alpha_mask != 0 ? MagickTrue : MagickFalse;
+      image->alpha_trait=bmp_info.alpha_mask != 0 ? MagickTrue : MagickFalse;
     if ((bmp_info.number_colors != 0) || (bmp_info.bits_per_pixel < 16))
       {
         size_t
@@ -1171,7 +1171,7 @@
             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
             SetPixelAlpha(image,OpaqueAlpha,q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,
                 ScaleShortToQuantum((unsigned short) opacity),q);
             q+=GetPixelChannels(image);
@@ -1266,7 +1266,7 @@
             SetPixelGreen(image,ScaleShortToQuantum((unsigned short) green),q);
             SetPixelBlue(image,ScaleShortToQuantum((unsigned short) blue),q);
             SetPixelAlpha(image,OpaqueAlpha,q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,
                 ScaleShortToQuantum((unsigned short) opacity),q);
             q+=GetPixelChannels(image);
@@ -1550,7 +1550,7 @@
         if (image_info->compression == RLECompression)
           bmp_info.bits_per_pixel=8;
         bmp_info.number_colors=1U << bmp_info.bits_per_pixel;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           (void) SetImageStorageClass(image,DirectClass,exception);
         else
           if ((size_t) bmp_info.number_colors < image->colors)
@@ -1573,9 +1573,9 @@
         */
         bmp_info.number_colors=0;
         bmp_info.bits_per_pixel=(unsigned short)
-          ((type > 3) && (image->matte != MagickFalse) ? 32 : 24);
+          ((type > 3) && (image->alpha_trait == BlendPixelTrait) ? 32 : 24);
         bmp_info.compression=(unsigned int) ((type > 3) &&
-          (image->matte != MagickFalse) ?  BI_BITFIELDS : BI_RGB);
+          (image->alpha_trait == BlendPixelTrait) ?  BI_BITFIELDS : BI_RGB);
       }
     bytes_per_line=4*((image->columns*bmp_info.bits_per_pixel+31)/32);
     bmp_info.ba_offset=0;
@@ -1586,7 +1586,7 @@
     if (type == 2)
       bmp_info.size=12;
     else
-      if ((type == 3) || ((image->matte == MagickFalse) &&
+      if ((type == 3) || ((image->alpha_trait != BlendPixelTrait) &&
           (have_color_info == MagickFalse)))
         {
           type=3;
@@ -1872,7 +1872,7 @@
             "   Storage class=PseudoClass");
         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
           "   Image depth=%.20g",(double) image->depth);
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
             "   Matte=True");
         else
@@ -1946,7 +1946,7 @@
         (void) WriteBlobLSBLong(image,bmp_info.number_colors);
         (void) WriteBlobLSBLong(image,bmp_info.colors_important);
       }
-    if ((type > 3) && ((image->matte != MagickFalse) ||
+    if ((type > 3) && ((image->alpha_trait == BlendPixelTrait) ||
         (have_color_info != MagickFalse)))
       {
         /*
diff --git a/coders/cmyk.c b/coders/cmyk.c
index f93498a..a4609af 100644
--- a/coders/cmyk.c
+++ b/coders/cmyk.c
@@ -168,7 +168,7 @@
   if (LocaleCompare(image_info->magick,"CMYKA") == 0)
     {
       quantum_type=CMYKAQuantum;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
     }
   if (image_info->number_scenes != 0)
     while (image->scene < image_info->scene)
@@ -252,7 +252,7 @@
                 SetPixelBlue(image,GetPixelBlue(canvas_image,p),q);
                 SetPixelBlack(image,GetPixelBlack(canvas_image,p),q);
                 SetPixelAlpha(image,OpaqueAlpha,q);
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                   SetPixelAlpha(image,GetPixelAlpha(canvas_image,p),q);
                 p+=GetPixelChannels(canvas_image);
                 q+=GetPixelChannels(image);
@@ -308,7 +308,7 @@
                 "UnexpectedEndOfFile",image->filename);
               break;
             }
-          for (i=0; i < (image->matte != MagickFalse ? 5 : 4); i++)
+          for (i=0; i < (image->alpha_trait == BlendPixelTrait ? 5 : 4); i++)
           {
             quantum_type=quantum_types[i];
             q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,
@@ -597,7 +597,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             for (y=0; y < (ssize_t) image->extract_info.height; y++)
             {
@@ -952,7 +952,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             (void) CloseBlob(image);
             AppendImageFormat("A",image->filename);
@@ -1224,7 +1224,7 @@
     if (LocaleCompare(image_info->magick,"CMYKA") == 0)
       {
         quantum_type=CMYKAQuantum;
-        if (image->matte == MagickFalse)
+        if (image->alpha_trait != BlendPixelTrait)
           (void) SetImageAlphaChannel(image,OpaqueAlphaChannel,exception);
       }
     quantum_info=AcquireQuantumInfo(image_info,image);
diff --git a/coders/dds.c b/coders/dds.c
index 51217d7..5039245 100644
--- a/coders/dds.c
+++ b/coders/dds.c
@@ -379,7 +379,7 @@
         image=SyncNextImageInList(image);
       }
     
-    image->matte = matte;
+    image->alpha_trait = matte;
     image->compression = compression;
     image->columns = dds_info.width;
     image->rows = dds_info.height;
@@ -549,8 +549,8 @@
               SetPixelGreen(image,ScaleCharToQuantum(colors.g[code]),q);
               SetPixelBlue(image,ScaleCharToQuantum(colors.b[code]),q);
               SetPixelAlpha(image,ScaleCharToQuantum(colors.a[code]),q);
-              if (colors.a[code] && (image->matte == MagickFalse))
-                image->matte=MagickTrue;  /* Correct matte */
+              if (colors.a[code] && (image->alpha_trait != BlendPixelTrait))
+                image->alpha_trait=BlendPixelTrait;  /* Correct matte */
               q+=GetPixelChannels(image);
             }
         }
diff --git a/coders/debug.c b/coders/debug.c
index d8be337..e5ca24e 100644
--- a/coders/debug.c
+++ b/coders/debug.c
@@ -208,7 +208,7 @@
       MagickColorspaceOptions,(ssize_t) image->colorspace),MaxTextExtent);
     LocaleLower(colorspace);
     image->depth=GetImageQuantumDepth(image,MagickTrue);
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       (void) ConcatenateMagickString(colorspace,"a",MaxTextExtent);
     (void) FormatLocaleString(buffer,MaxTextExtent,
       "# ImageMagick pixel debugging: %.20g,%.20g,%.20g,%s\n",(double)
@@ -238,7 +238,7 @@
               (double) pixel.black);
             (void) ConcatenateMagickString(tuple,black,MaxTextExtent);
           }
-        if (pixel.matte != MagickFalse)
+        if (pixel.alpha_trait == BlendPixelTrait)
           {
             char
               alpha[MaxTextExtent];
diff --git a/coders/dib.c b/coders/dib.c
index 3214830..0872aae 100644
--- a/coders/dib.c
+++ b/coders/dib.c
@@ -535,7 +535,7 @@
       dib_info.green_mask=ReadBlobLSBLong(image);
       dib_info.blue_mask=ReadBlobLSBLong(image);
     }
-  image->matte=dib_info.bits_per_pixel == 32 ? MagickTrue : MagickFalse;
+  image->alpha_trait=dib_info.bits_per_pixel == 32 ? MagickTrue : MagickFalse;
   image->columns=(size_t) MagickAbsoluteValue(dib_info.width);
   image->rows=(size_t) MagickAbsoluteValue(dib_info.height);
   image->depth=8;
@@ -828,7 +828,7 @@
           SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
           SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
           SetPixelRed(image,ScaleCharToQuantum(*p++),q);
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
           q+=GetPixelChannels(image);
         }
@@ -1018,7 +1018,7 @@
         Full color DIB raster.
       */
       dib_info.number_colors=0;
-      dib_info.bits_per_pixel=(unsigned short) (image->matte ? 32 : 24);
+      dib_info.bits_per_pixel=(unsigned short) (image->alpha_trait ? 32 : 24);
     }
   else
     {
@@ -1189,7 +1189,7 @@
           *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
           *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
           *q++=ScaleQuantumToChar(GetPixelRed(image,p));
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
           p+=GetPixelChannels(image);
         }
diff --git a/coders/djvu.c b/coders/djvu.c
index 5abe9c6..5074b0d 100644
--- a/coders/djvu.c
+++ b/coders/djvu.c
@@ -662,7 +662,7 @@
                 /* fixme:  MAGICKCORE_QUANTUM_DEPTH ?*/
                 image->depth =  8UL;    /* i only support that? */
 
-                image->matte = MagickTrue;
+                image->alpha_trait = MagickTrue;
                 /* is this useful? */
         }
 #if DEBUG
diff --git a/coders/dps.c b/coders/dps.c
index 1498ed8..f4f529c 100644
--- a/coders/dps.c
+++ b/coders/dps.c
@@ -490,7 +490,7 @@
           if (matte_image != (XImage *) NULL)
             {
               image->storage_class=DirectClass;
-              image->matte=MagickTrue;
+              image->alpha_trait=BlendPixelTrait;
               for (y=0; y < (ssize_t) image->rows; y++)
               {
                 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
diff --git a/coders/dpx.c b/coders/dpx.c
index 3b3b2ef..7ce0381 100644
--- a/coders/dpx.c
+++ b/coders/dpx.c
@@ -1033,7 +1033,7 @@
     case ABGRComponentType:
     case RGBAComponentType:
     {
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
       samples_per_pixel=4;
       quantum_type=RGBAQuantum;
       break;
@@ -1468,17 +1468,17 @@
         case YCbCrColorspace:
         {
           dpx.image.image_element[i].descriptor=CbYCr444ComponentType;
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             dpx.image.image_element[i].descriptor=CbYCrA4444ComponentType;
           break;
         }
         default:
         {
           dpx.image.image_element[i].descriptor=RGBComponentType;
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             dpx.image.image_element[i].descriptor=RGBAComponentType;
           if ((image_info->type != TrueColorType) &&
-              (image->matte == MagickFalse) &&
+              (image->alpha_trait != BlendPixelTrait) &&
               (IsImageGray(image,exception) != MagickFalse))
             dpx.image.image_element[i].descriptor=LumaComponentType;
           break;
@@ -1799,19 +1799,19 @@
   SetQuantumPack(quantum_info,dpx.image.image_element[0].packing == 0 ?
     MagickTrue : MagickFalse);
   quantum_type=RGBQuantum;
-  if (image->matte != MagickFalse)
+  if (image->alpha_trait == BlendPixelTrait)
     quantum_type=RGBAQuantum;
   if (image->colorspace == YCbCrColorspace)
     {
       quantum_type=CbYCrQuantum;
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         quantum_type=CbYCrAQuantum;
       if ((horizontal_factor == 2) || (vertical_factor == 2))
         quantum_type=CbYCrYQuantum;
     }
-  extent=GetBytesPerRow(image->columns,image->matte != MagickFalse ? 4UL : 3UL,
+  extent=GetBytesPerRow(image->columns,image->alpha_trait == BlendPixelTrait ? 4UL : 3UL,
     image->depth,MagickTrue);
-  if ((image_info->type != TrueColorType) && (image->matte == MagickFalse) &&
+  if ((image_info->type != TrueColorType) && (image->alpha_trait != BlendPixelTrait) &&
       (IsImageGray(image,exception) != MagickFalse))
     {
       quantum_type=GrayQuantum;
diff --git a/coders/exr.c b/coders/exr.c
index 1d72f67..fa89ca8 100644
--- a/coders/exr.c
+++ b/coders/exr.c
@@ -199,7 +199,7 @@
   ImfHeaderDisplayWindow(hdr_info,&min_x,&min_y,&max_x,&max_y);
   image->columns=max_x-min_x+1UL;
   image->rows=max_y-min_y+1UL;
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   SetImageColorspace(image,RGBColorspace,exception);
   image->gamma=1.0;
   if (image_info->ping != MagickFalse)
@@ -447,7 +447,7 @@
       scanline[x].g=half_quantum;
       ImfFloatToHalf(QuantumScale*GetPixelBlue(image,p),&half_quantum);
       scanline[x].b=half_quantum;
-      if (image->matte == MagickFalse)
+      if (image->alpha_trait != BlendPixelTrait)
         ImfFloatToHalf(1.0,&half_quantum);
       else
         ImfFloatToHalf(QuantumScale*GetPixelAlpha(image,p),&half_quantum);
diff --git a/coders/fpx.c b/coders/fpx.c
index 643585e..e1a775a 100644
--- a/coders/fpx.c
+++ b/coders/fpx.c
@@ -366,7 +366,7 @@
   image->columns=width;
   image->rows=height;
   if ((colorspace.numberOfComponents % 2) == 0)
-    image->matte=MagickTrue;
+    image->alpha_trait=BlendPixelTrait;
   if (colorspace.numberOfComponents == 1)
     {
       /*
@@ -473,7 +473,7 @@
           SetPixelBlue(image,index,q);
         }
       SetPixelAlpha(image,OpaqueAlpha,q);
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         SetPixelAlpha(image,ScaleCharToQuantum(*a),q);
       q+=GetPixelChannels(image);
       r+=red_component->columnStride;
@@ -867,7 +867,7 @@
   tile_width=64;
   tile_height=64;
   colorspace.numberOfComponents=3;
-  if (image->matte != MagickFalse)
+  if (image->alpha_trait == BlendPixelTrait)
     colorspace.numberOfComponents=4;
   if ((image_info->type != TrueColorType) &&
       (IsImageGray(image,exception) != MagickFalse))
@@ -987,7 +987,7 @@
     Write image pixelss.
   */
   quantum_type=RGBQuantum;
-  if (image->matte != MagickFalse)
+  if (image->alpha_trait == BlendPixelTrait)
     quantum_type=RGBAQuantum;
   if (fpx_info.numberOfComponents == 1)
     quantum_type=GrayQuantum;
diff --git a/coders/gif.c b/coders/gif.c
index f830ed8..0ba987f 100644
--- a/coders/gif.c
+++ b/coders/gif.c
@@ -1253,7 +1253,7 @@
     image->ticks_per_second=100;
     image->dispose=(DisposeType) dispose;
     image->iterations=iterations;
-    image->matte=opacity >= 0 ? MagickTrue : MagickFalse;
+    image->alpha_trait=opacity >= 0 ? MagickTrue : MagickFalse;
     delay=0;
     dispose=0;
     iterations=1;
diff --git a/coders/gradient.c b/coders/gradient.c
index d1330fb..3104ae6 100644
--- a/coders/gradient.c
+++ b/coders/gradient.c
@@ -158,7 +158,7 @@
       image=DestroyImageList(image);
       return((Image *) NULL);
     }
-  if ((start_color.matte == MagickFalse) && (stop_color.matte == MagickFalse))
+  if ((start_color.alpha_trait != BlendPixelTrait) && (stop_color.alpha_trait != BlendPixelTrait))
     (void) SetImageAlphaChannel(image,DeactivateAlphaChannel,exception);
   return(GetFirstImageInList(image));
 }
diff --git a/coders/icon.c b/coders/icon.c
index 744cc74..2914a7a 100644
--- a/coders/icon.c
+++ b/coders/icon.c
@@ -314,7 +314,7 @@
         icon_info.y_pixels=ReadBlobLSBLong(image);
         icon_info.number_colors=ReadBlobLSBLong(image);
         icon_info.colors_important=ReadBlobLSBLong(image);
-        image->matte=MagickTrue;
+        image->alpha_trait=BlendPixelTrait;
         image->columns=(size_t) icon_file.directory[i].width;
         if ((ssize_t) image->columns > icon_info.width)
           image->columns=(size_t) icon_info.width;
@@ -1134,7 +1134,7 @@
                 *q++=ScaleQuantumToChar(GetPixelBlue(next,p));
                 *q++=ScaleQuantumToChar(GetPixelGreen(next,p));
                 *q++=ScaleQuantumToChar(GetPixelRed(next,p));
-                if (next->matte == MagickFalse)
+                if (next->alpha_trait != BlendPixelTrait)
                   *q++=ScaleQuantumToChar(QuantumRange);
                 else
                   *q++=ScaleQuantumToChar(GetPixelAlpha(next,p));
@@ -1224,7 +1224,7 @@
           for (x=0; x < (ssize_t) next->columns; x++)
           {
             byte<<=1;
-            if ((next->matte == MagickTrue) &&
+            if ((next->alpha_trait == BlendPixelTrait) &&
                 (GetPixelAlpha(next,p) == (Quantum) TransparentAlpha))
               byte|=0x01;
             bit++;
diff --git a/coders/jp2.c b/coders/jp2.c
index 86f5666..d9c3008 100644
--- a/coders/jp2.c
+++ b/coders/jp2.c
@@ -423,7 +423,7 @@
       components[3]=jas_image_getcmptbytype(jp2_image,3);
       if (components[3] > 0)
         {
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
           number_components++;
         }
       break;
@@ -457,7 +457,7 @@
       components[3]=jas_image_getcmptbytype(jp2_image,JAS_IMAGE_CT_UNKNOWN);
       if (components[3] > 0)
         {
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
           number_components++;
         }
       break;
@@ -478,7 +478,7 @@
       components[3]=jas_image_getcmptbytype(jp2_image,JAS_IMAGE_CT_UNKNOWN);
       if (components[3] > 0)
         {
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
           number_components++;
         }
       break;
@@ -499,7 +499,7 @@
       components[3]=jas_image_getcmptbytype(jp2_image,JAS_IMAGE_CT_UNKNOWN);
       if (components[3] > 0)
         {
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
           number_components++;
         }
       break;
@@ -536,7 +536,7 @@
   /*
     Convert JPEG 2000 pixels.
   */
-  image->matte=number_components > 3 ? MagickTrue : MagickFalse;
+  image->alpha_trait=number_components > 3 ? MagickTrue : MagickFalse;
   maximum_component_depth=0;
   for (i=0; i < (ssize_t) number_components; i++)
   {
@@ -916,7 +916,7 @@
   jp2_stream=JP2StreamManager(image);
   if (jp2_stream == (jas_stream_t *) NULL)
     ThrowWriterException(DelegateError,"UnableToManageJP2Stream");
-  number_components=image->matte ? 4UL : 3UL;
+  number_components=image->alpha_trait ? 4UL : 3UL;
   if (IsGrayColorspace(image->colorspace) != MagickFalse)
     number_components=1;
   if ((image->columns != (unsigned int) image->columns) ||
diff --git a/coders/matte.c b/coders/matte.c
index a666d92..b8b6f86 100644
--- a/coders/matte.c
+++ b/coders/matte.c
@@ -175,13 +175,13 @@
   ssize_t
     y;
 
-  if (image->matte == MagickFalse)
+  if (image->alpha_trait != BlendPixelTrait)
     ThrowWriterException(CoderError,"ImageDoesNotHaveAAlphaChannel");
   matte_image=CloneImage(image,image->columns,image->rows,MagickTrue,exception);
   if (matte_image == (Image *) NULL)
     return(MagickFalse);
   (void) SetImageType(matte_image,TrueColorMatteType,exception);
-  matte_image->matte=MagickFalse;
+  matte_image->alpha_trait=UndefinedPixelTrait;
   /*
     Convert image to matte pixels.
   */
diff --git a/coders/miff.c b/coders/miff.c
index 30b4b4d..445fd11 100644
--- a/coders/miff.c
+++ b/coders/miff.c
@@ -242,7 +242,7 @@
           unsigned char
             quantum;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               p=PushCharPixel(p,&quantum);
               pixel->alpha=ScaleCharToQuantum(quantum);
@@ -254,7 +254,7 @@
           unsigned short
             quantum;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               p=PushShortPixel(MSBEndian,p,&quantum);
               pixel->alpha=(Quantum) (quantum >> (image->depth-
@@ -267,7 +267,7 @@
           unsigned int
             quantum;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               p=PushLongPixel(MSBEndian,p,&quantum);
               pixel->alpha=(Quantum) (quantum >> (image->depth-
@@ -305,7 +305,7 @@
           p=PushCharPixel(p,&quantum);
           pixel->black=ScaleCharToQuantum(quantum);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           p=PushCharPixel(p,&quantum);
           pixel->alpha=ScaleCharToQuantum(quantum);
@@ -333,7 +333,7 @@
           p=PushShortPixel(MSBEndian,p,&quantum);
           pixel->black=quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           p=PushShortPixel(MSBEndian,p,&quantum);
           pixel->alpha=quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH);
@@ -361,7 +361,7 @@
           p=PushLongPixel(MSBEndian,p,&quantum);
           pixel->black=quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           p=PushLongPixel(MSBEndian,p,&quantum);
           pixel->alpha=quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH);
@@ -621,8 +621,7 @@
                   if (*options != '{')
                     if (isspace((int) ((unsigned char) c)) != 0)
                       break;
-                }
-              }
+                } }
             *p='\0';
             if (*options == '{')
               (void) strcpy(options,options+1);
@@ -631,6 +630,24 @@
             */
             switch (*keyword)
             {
+              case 'a':
+              case 'A':
+              {
+                if (LocaleCompare(keyword,"alpha-trait") == 0)
+                  {
+                    ssize_t
+                      alpha_trait;
+
+                    alpha_trait=ParseCommandOption(MagickPixelTraitOptions,
+                      MagickFalse,options);
+                    if (alpha_trait < 0)
+                      break;
+                    image->alpha_trait=(PixelTrait) alpha_trait;
+                    break;
+                  }
+                (void) SetImageProperty(image,keyword,options,exception);
+                break;
+              }
               case 'b':
               case 'B':
               {
@@ -818,7 +835,8 @@
                       options);
                     if (matte < 0)
                       break;
-                    image->matte=(MagickBooleanType) matte;
+                    image->alpha_trait=matte == 0 ? UndefinedPixelTrait :
+                      BlendPixelTrait;
                     break;
                   }
                 if (LocaleCompare(keyword,"matte-color") == 0)
@@ -838,18 +856,6 @@
               case 'o':
               case 'O':
               {
-                if (LocaleCompare(keyword,"opaque") == 0)
-                  {
-                    ssize_t
-                      matte;
-
-                    matte=ParseCommandOption(MagickBooleanOptions,MagickFalse,
-                      options);
-                    if (matte < 0)
-                      break;
-                    image->matte=(MagickBooleanType) matte;
-                    break;
-                  }
                 if (LocaleCompare(keyword,"orientation") == 0)
                   {
                     ssize_t
@@ -1239,7 +1245,7 @@
       packet_size=(size_t) (3*quantum_info->depth/8);
     if (IsGrayColorspace(image->colorspace) != MagickFalse)
       packet_size=quantum_info->depth/8;
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       packet_size+=quantum_info->depth/8;
     if (image->colorspace == CMYKColorspace)
       packet_size+=quantum_info->depth/8;
@@ -1257,24 +1263,24 @@
       Read image pixels.
     */
     quantum_type=RGBQuantum;
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       quantum_type=RGBAQuantum;
     if (image->colorspace == CMYKColorspace)
       {
         quantum_type=CMYKQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           quantum_type=CMYKAQuantum;
       }
     if (IsGrayColorspace(image->colorspace) != MagickFalse)
       {
         quantum_type=GrayQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           quantum_type=GrayAlphaQuantum;
       }
     if (image->storage_class == PseudoClass)
       {
         quantum_type=IndexQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           quantum_type=IndexAlphaQuantum;
       }
     status=MagickTrue;
@@ -1456,7 +1462,7 @@
                 if (image->colorspace == CMYKColorspace)
                   SetPixelBlack(image,ClampToQuantum(pixel.black),q);
               }
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,ClampToQuantum(pixel.alpha),q);
             q+=GetPixelChannels(image);
           }
@@ -1722,7 +1728,7 @@
           unsigned int
             value;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               value=ScaleQuantumToLong(ClampToQuantum(pixel->alpha));
               pixels=PopLongPixel(MSBEndian,value,pixels);
@@ -1734,7 +1740,7 @@
           unsigned short
             value;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               value=ScaleQuantumToShort(ClampToQuantum(pixel->alpha));
               pixels=PopShortPixel(MSBEndian,value,pixels);
@@ -1746,7 +1752,7 @@
           unsigned char
             value;
 
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               value=(unsigned char) ScaleQuantumToChar(ClampToQuantum(
                 pixel->alpha));
@@ -1782,7 +1788,7 @@
           value=ScaleQuantumToLong(ClampToQuantum(pixel->black));
           pixels=PopLongPixel(MSBEndian,value,pixels);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           value=ScaleQuantumToLong(ClampToQuantum(pixel->alpha));
           pixels=PopLongPixel(MSBEndian,value,pixels);
@@ -1808,7 +1814,7 @@
           value=ScaleQuantumToShort(ClampToQuantum(pixel->black));
           pixels=PopShortPixel(MSBEndian,value,pixels);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           value=ScaleQuantumToShort(ClampToQuantum(pixel->alpha));
           pixels=PopShortPixel(MSBEndian,value,pixels);
@@ -1836,7 +1842,7 @@
             pixel->black));
           pixels=PopCharPixel(value,pixels);
         }
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           value=(unsigned char) ScaleQuantumToChar(ClampToQuantum(
             pixel->alpha));
@@ -1983,7 +1989,7 @@
       packet_size=(size_t) (3*quantum_info->depth/8);
     if (IsGrayColorspace(image->colorspace) != MagickFalse)
       packet_size=(size_t) (quantum_info->depth/8);
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       packet_size+=quantum_info->depth/8;
     if (image->colorspace == CMYKColorspace)
       packet_size+=quantum_info->depth/8;
@@ -2004,9 +2010,10 @@
     */
     (void) WriteBlobString(image,"id=ImageMagick  version=1.0\n");
     (void) FormatLocaleString(buffer,MaxTextExtent,
-      "class=%s  colors=%.20g  matte=%s\n",CommandOptionToMnemonic(
+      "class=%s  colors=%.20g  alpha-trait=%s\n",CommandOptionToMnemonic(
       MagickClassOptions,image->storage_class),(double) image->colors,
-      CommandOptionToMnemonic(MagickBooleanOptions,(ssize_t) image->matte));
+      CommandOptionToMnemonic(MagickPixelTraitOptions,(ssize_t)
+      image->alpha_trait));
     (void) WriteBlobString(image,buffer);
     (void) FormatLocaleString(buffer,MaxTextExtent,"columns=%.20g  rows=%.20g  "
       "depth=%.20g\n",(double) image->columns,(double) image->rows,(double)
diff --git a/coders/mpc.c b/coders/mpc.c
index 429ce79..4ad636d 100644
--- a/coders/mpc.c
+++ b/coders/mpc.c
@@ -331,6 +331,24 @@
             */
             switch (*keyword)
             {
+              case 'a':
+              case 'A':
+              {
+                if (LocaleCompare(keyword,"alpha-trait") == 0)
+                  {
+                    ssize_t
+                      alpha_trait;
+
+                    alpha_trait=ParseCommandOption(MagickPixelTraitOptions,
+                      MagickFalse,options);
+                    if (alpha_trait < 0)
+                      break;
+                    image->alpha_trait=(PixelTrait) alpha_trait;
+                    break;
+                  }
+                (void) SetImageProperty(image,keyword,options,exception);
+                break;
+              }
               case 'b':
               case 'B':
               {
@@ -503,18 +521,6 @@
               case 'm':
               case 'M':
               {
-                if (LocaleCompare(keyword,"matte") == 0)
-                  {
-                    ssize_t
-                      matte;
-
-                    matte=ParseCommandOption(MagickBooleanOptions,MagickFalse,
-                      options);
-                    if (matte < 0)
-                      break;
-                    image->matte=(MagickBooleanType) matte;
-                    break;
-                  }
                 if (LocaleCompare(keyword,"matte-color") == 0)
                   {
                     (void) QueryColorCompliance(options,AllCompliance,
@@ -544,18 +550,6 @@
               case 'o':
               case 'O':
               {
-                if (LocaleCompare(keyword,"opaque") == 0)
-                  {
-                    ssize_t
-                      matte;
-
-                    matte=ParseCommandOption(MagickBooleanOptions,MagickFalse,
-                      options);
-                    if (matte < 0)
-                      break;
-                    image->matte=(MagickBooleanType) matte;
-                    break;
-                  }
                 if (LocaleCompare(keyword,"orientation") == 0)
                   {
                     ssize_t
@@ -1101,9 +1095,10 @@
       MAGICKCORE_QUANTUM_DEPTH);
     (void) WriteBlobString(image,buffer);
     (void) FormatLocaleString(buffer,MaxTextExtent,
-      "class=%s  colors=%.20g  matte=%s\n",CommandOptionToMnemonic(
+      "class=%s  colors=%.20g  alpha-trait=%s\n",CommandOptionToMnemonic(
       MagickClassOptions,image->storage_class),(double) image->colors,
-      CommandOptionToMnemonic(MagickBooleanOptions,(ssize_t) image->matte));
+      CommandOptionToMnemonic(MagickPixelTraitOptions,(ssize_t)
+      image->alpha_trait));
     (void) WriteBlobString(image,buffer);
     (void) FormatLocaleString(buffer,MaxTextExtent,
       "columns=%.20g  rows=%.20g depth=%.20g\n",(double) image->columns,
diff --git a/coders/msl.c b/coders/msl.c
index af33f89..ba3b828 100644
--- a/coders/msl.c
+++ b/coders/msl.c
@@ -1952,7 +1952,7 @@
                         }
                       (void) SetImageArtifact(msl_info->image[n],
                                             "compose:args",value);
-                      if (composite_image->matte != MagickTrue)
+                      if (composite_image->alpha_trait == UndefinedPixelTrait)
                         (void) SetImageAlpha(composite_image,OpaqueAlpha,
                           &exception);
                       composite_view=AcquireAuthenticCacheView(composite_image,
diff --git a/coders/null.c b/coders/null.c
index 454cf68..5770b9c 100644
--- a/coders/null.c
+++ b/coders/null.c
@@ -126,7 +126,7 @@
     image->columns=1;
   if (image->rows == 0)
     image->rows=1;
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   GetPixelInfo(image,&background);
   background.alpha=(double) TransparentAlpha;
   if (image->colorspace == CMYKColorspace)
diff --git a/coders/pcx.c b/coders/pcx.c
index c93fa6c..38c107b 100644
--- a/coders/pcx.c
+++ b/coders/pcx.c
@@ -431,7 +431,7 @@
         }
       }
     if (image->storage_class == DirectClass)
-      image->matte=pcx_info.planes > 3 ? MagickTrue : MagickFalse;
+      image->alpha_trait=pcx_info.planes > 3 ? MagickTrue : MagickFalse;
     else
       if ((pcx_info.version == 5) ||
           ((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
@@ -607,7 +607,7 @@
             SetPixelRed(image,ScaleCharToQuantum(*r++),q);
             SetPixelGreen(image,ScaleCharToQuantum(*r++),q);
             SetPixelBlue(image,ScaleCharToQuantum(*r++),q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,ScaleCharToQuantum(*r++),q);
           }
         q+=GetPixelChannels(image);
@@ -940,7 +940,7 @@
     if ((image->storage_class == DirectClass) || (image->colors > 256))
       {
         pcx_info.planes=3;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           pcx_info.planes++;
       }
     pcx_info.bytes_per_line=(unsigned short) (((size_t) image->columns*
diff --git a/coders/pdf.c b/coders/pdf.c
index 3055eaf..db9d06c 100644
--- a/coders/pdf.c
+++ b/coders/pdf.c
@@ -1089,7 +1089,7 @@
   if (image_info->compression == JPEG2000Compression)
     version=(size_t) MagickMax(version,5);
   for (next=image; next != (Image *) NULL; next=GetNextImageInList(next))
-    if (next->matte != MagickFalse)
+    if (next->alpha_trait == BlendPixelTrait)
       version=(size_t) MagickMax(version,4);
   if (LocaleCompare(image_info->magick,"PDFA") == 0)
     version=(size_t) MagickMax(version,6);
@@ -1218,7 +1218,7 @@
       case Group4Compression:
       {
         if ((IsImageMonochrome(image,exception) == MagickFalse) ||
-            (image->matte != MagickFalse))
+            (image->alpha_trait == BlendPixelTrait))
           compression=RLECompression;
         break;
       }
@@ -1554,7 +1554,7 @@
       (compression == FaxCompression) || (compression == Group4Compression) ?
       1 : 8);
     (void) WriteBlobString(image,buffer);
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       {
         (void) FormatLocaleString(buffer,MaxTextExtent,"/SMask %.20g 0 R\n",
           (double) object+7);
@@ -2393,7 +2393,7 @@
       object);
     (void) WriteBlobString(image,buffer);
     (void) WriteBlobString(image,"<<\n");
-    if (image->matte == MagickFalse)
+    if (image->alpha_trait != BlendPixelTrait)
       (void) WriteBlobString(image,">>\n");
     else
       {
diff --git a/coders/pict.c b/coders/pict.c
index 09ba705..8b3e77a 100644
--- a/coders/pict.c
+++ b/coders/pict.c
@@ -470,7 +470,7 @@
     }
   else
     if (bits_per_pixel == 32)
-      width*=image->matte ? 4 : 3;
+      width*=image->alpha_trait ? 4 : 3;
   if (bytes_per_line == 0)
     bytes_per_line=width;
   row_bytes=(size_t) (image->columns | 0x8000);
@@ -1075,13 +1075,13 @@
               {
                 ReadPixmap(pixmap);
                 tile_image->depth=1UL*pixmap.component_size;
-                tile_image->matte=pixmap.component_count == 4 ?
+                tile_image->alpha_trait=pixmap.component_count == 4 ?
                   MagickTrue : MagickFalse;
                 tile_image->resolution.x=(double) pixmap.horizontal_resolution;
                 tile_image->resolution.y=(double) pixmap.vertical_resolution;
                 tile_image->units=PixelsPerInchResolution;
-                if (tile_image->matte != MagickFalse)
-                  image->matte=tile_image->matte;
+                if (tile_image->alpha_trait == BlendPixelTrait)
+                  image->alpha_trait=tile_image->alpha_trait;
               }
             if ((code != 0x9a) && (code != 0x9b))
               {
@@ -1196,7 +1196,7 @@
                           (unsigned char) ((j & 0x1f) << 3)),q);
                       }
                     else
-                      if (tile_image->matte == MagickFalse)
+                      if (tile_image->alpha_trait != BlendPixelTrait)
                         {
                           if (p > (pixels+extent+2*image->columns))
                             ThrowReaderException(CorruptImageError,
@@ -1640,9 +1640,9 @@
   storage_class=image->storage_class;
   if (image_info->compression == JPEGCompression)
     storage_class=DirectClass;
-  if ((storage_class == DirectClass) || (image->matte != MagickFalse))
+  if ((storage_class == DirectClass) || (image->alpha_trait == BlendPixelTrait))
     {
-      pixmap.component_count=image->matte ? 4 : 3;
+      pixmap.component_count=image->alpha_trait ? 4 : 3;
       pixmap.pixel_type=16;
       pixmap.bits_per_pixel=32;
       pixmap.pack_type=0x04;
@@ -1653,8 +1653,8 @@
     Allocate memory.
   */
   bytes_per_line=image->columns;
-  if ((storage_class == DirectClass) || (image->matte != MagickFalse))
-    bytes_per_line*=image->matte ? 4 : 3;
+  if ((storage_class == DirectClass) || (image->alpha_trait == BlendPixelTrait))
+    bytes_per_line*=image->alpha_trait ? 4 : 3;
   buffer=(unsigned char *) AcquireQuantumMemory(PictInfoSize,sizeof(*buffer));
   packed_scanline=(unsigned char *) AcquireQuantumMemory((size_t)
    (row_bytes+MaxCount),sizeof(*packed_scanline));
@@ -1877,7 +1877,7 @@
     Write picture data.
   */
   count=0;
-  if ((storage_class == PseudoClass) && (image->matte == MagickFalse))
+  if ((storage_class == PseudoClass) && (image->alpha_trait != BlendPixelTrait))
     for (y=0; y < (ssize_t) image->rows; y++)
     {
       p=GetVirtualPixels(image,0,y,image->columns,1,exception);
@@ -1926,7 +1926,7 @@
           red=scanline;
           green=scanline+image->columns;
           blue=scanline+2*image->columns;
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             {
               opacity=scanline;
               red=scanline+image->columns;
@@ -1938,7 +1938,7 @@
             *red++=ScaleQuantumToChar(GetPixelRed(image,p));
             *green++=ScaleQuantumToChar(GetPixelGreen(image,p));
             *blue++=ScaleQuantumToChar(GetPixelBlue(image,p));
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               *opacity++=ScaleQuantumToChar((Quantum) (GetPixelAlpha(image,p)));
             p+=GetPixelChannels(image);
           }
diff --git a/coders/png.c b/coders/png.c
index 28b4c59..2fb2231 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -2143,7 +2143,7 @@
   if (logging != MagickFalse)
   {
     (void)LogMagickEvent(CoderEvent,GetMagickModule(),
-      "  image->matte=%d",(int) image->matte);
+      "  image->alpha_trait=%d",(int) image->alpha_trait);
 
     (void)LogMagickEvent(CoderEvent,GetMagickModule(),
       "  image->rendering_intent=%d",(int) image->rendering_intent);
@@ -2723,7 +2723,7 @@
               "    Ignoring PNG tRNS chunk with out-of-range sample.");
           png_free_data(ping, ping_info, PNG_FREE_TRNS, 0);
           png_set_invalid(ping,ping_info,PNG_INFO_tRNS);
-          image->matte=MagickFalse;
+          image->alpha_trait=UndefinedPixelTrait;
         }
       else
         {
@@ -3012,7 +3012,7 @@
 
         depth=(ssize_t) ping_bit_depth;
 #endif
-        image->matte=(((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA) ||
+        image->alpha_trait=(((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA) ||
             ((int) ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
             (png_get_valid(ping,ping_info,PNG_INFO_tRNS))) ?
             MagickTrue : MagickFalse;
@@ -3128,11 +3128,11 @@
         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
           "    Converting grayscale pixels to pixel packets");
 
-      image->matte=ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA ?
+      image->alpha_trait=ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA ?
         MagickTrue : MagickFalse;
 
       quantum_scanline=(Quantum *) AcquireQuantumMemory(image->columns,
-        (image->matte ?  2 : 1)*sizeof(*quantum_scanline));
+        (image->alpha_trait ?  2 : 1)*sizeof(*quantum_scanline));
 
       if (quantum_scanline == (Quantum *) NULL)
         png_error(ping,"Memory allocation failed");
@@ -3322,7 +3322,7 @@
       quantum_scanline=(Quantum *) RelinquishMagickMemory(quantum_scanline);
     }
 
-    image->matte=found_transparent_pixel;
+    image->alpha_trait=found_transparent_pixel;
 
     if (logging != MagickFalse)
       {
@@ -3347,10 +3347,10 @@
       MagickBooleanType
         matte;
 
-      matte=image->matte;
-      image->matte=MagickFalse;
+      matte=image->alpha_trait;
+      image->alpha_trait=UndefinedPixelTrait;
       (void) SyncImage(image,exception);
-      image->matte=matte;
+      image->alpha_trait=matte;
     }
 
   png_read_end(ping,end_info);
@@ -3380,7 +3380,7 @@
         Image has a transparent background.
       */
       storage_class=image->storage_class;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
 
 /* Balfour fix from imagemagick discourse server, 5 Feb 2010 */
 
@@ -3390,7 +3390,7 @@
             {
               for (x=0; x < ping_num_trans; x++)
               {
-                 image->colormap[x].matte=MagickTrue;
+                 image->colormap[x].alpha_trait=BlendPixelTrait;
                  image->colormap[x].alpha =
                    ScaleCharToQuantum((unsigned char)ping_trans_alpha[x]);
               }
@@ -3403,7 +3403,7 @@
                  if (ScaleQuantumToShort(image->colormap[x].red) ==
                      transparent_color.alpha)
                  {
-                    image->colormap[x].matte=MagickTrue;
+                    image->colormap[x].alpha_trait=BlendPixelTrait;
                     image->colormap[x].alpha = (Quantum) TransparentAlpha;
                  }
               }
@@ -3604,11 +3604,11 @@
     }
 #endif
 
-   /* Set image->matte to MagickTrue if the input colortype supports
+   /* Set image->alpha_trait to MagickTrue if the input colortype supports
     * alpha or if a valid tRNS chunk is present, no matter whether there
     * is actual transparency present.
     */
-    image->matte=(((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA) ||
+    image->alpha_trait=(((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA) ||
         ((int) ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
         (png_get_valid(ping,ping_info,PNG_INFO_tRNS))) ?
         MagickTrue : MagickFalse;
@@ -3845,7 +3845,7 @@
   if (LocaleCompare(image_info->magick,"PNG24") == 0)
     {
       (void) SetImageType(image,TrueColorType,exception);
-      image->matte=MagickFalse;
+      image->alpha_trait=UndefinedPixelTrait;
     }
 
   if (LocaleCompare(image_info->magick,"PNG32") == 0)
@@ -4518,7 +4518,7 @@
                exception);
              q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
 
-             if (image->matte != MagickFalse)
+             if (image->alpha_trait == BlendPixelTrait)
                for (x=(ssize_t) image->columns; x != 0; x--)
                {
                   SetPixelAlpha(image,GetPixelRed(jng_image,s),q);
@@ -4531,7 +4531,7 @@
                {
                   SetPixelAlpha(image,GetPixelRed(jng_image,s),q);
                   if (GetPixelAlpha(image,q) != OpaqueAlpha)
-                    image->matte=MagickTrue;
+                    image->alpha_trait=BlendPixelTrait;
                   q+=GetPixelChannels(image);
                   s+=GetPixelChannels(jng_image);
                }
@@ -5503,7 +5503,7 @@
                 image->page.x=mng_info->clip.left;
                 image->page.y=mng_info->clip.top;
                 image->background_color=mng_background_color;
-                image->matte=MagickFalse;
+                image->alpha_trait=UndefinedPixelTrait;
                 image->delay=0;
                 (void) SetImageBackgroundColor(image,exception);
 
@@ -6111,7 +6111,7 @@
             image->page.x=mng_info->clip.left;
             image->page.y=mng_info->clip.top;
             image->background_color=mng_background_color;
-            image->matte=MagickFalse;
+            image->alpha_trait=UndefinedPixelTrait;
             (void) SetImageBackgroundColor(image,exception);
 
             if (logging != MagickFalse)
@@ -6374,7 +6374,7 @@
 #define QM Quantum
 #endif
 
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                    (void) SetImageBackgroundColor(large_image,exception);
 
                 else
@@ -6513,7 +6513,7 @@
                                  ((ssize_t) (m*2))
                                  +GetPixelBlue(image,pixels)))),q);
 
-                              if (image->matte != MagickFalse)
+                              if (image->alpha_trait == BlendPixelTrait)
                                  SetPixelAlpha(large_image, ((QM) (((ssize_t)
                                     (2*i*(GetPixelAlpha(image,n)
                                     -GetPixelAlpha(image,pixels)+m))
@@ -6670,7 +6670,7 @@
                                  -GetPixelBlue(image,pixels))+m)
                                  /((ssize_t) (m*2))+
                                  GetPixelBlue(image,pixels)),q);
-                              if (image->matte != MagickFalse)
+                              if (image->alpha_trait == BlendPixelTrait)
                                  SetPixelAlpha(image,(QM) ((2*i*(
                                    GetPixelAlpha(image,n)
                                    -GetPixelAlpha(image,pixels))+m)
@@ -6921,7 +6921,7 @@
       image->page.x=0;
       image->page.y=0;
       image->background_color=mng_background_color;
-      image->matte=MagickFalse;
+      image->alpha_trait=UndefinedPixelTrait;
 
       if (image_info->ping == MagickFalse)
         (void) SetImageBackgroundColor(image,exception);
@@ -8117,7 +8117,7 @@
      * This code will delete the colormap and change the image to
      * DirectClass.
      *
-     * If image->matte is MagickFalse, we ignore the alpha channel
+     * If image->alpha_trait is MagickFalse, we ignore the alpha channel
      * even though it sometimes contains left-over non-opaque values.
      *
      * Also we gather some information (number of opaque, transparent,
@@ -8154,7 +8154,7 @@
        (void) LogMagickEvent(CoderEvent,GetMagickModule(),
              "      image->rows=%.20g",(double) image->rows);
        (void) LogMagickEvent(CoderEvent,GetMagickModule(),
-             "      image->matte=%.20g",(double) image->matte);
+             "      image->alpha_trait=%.20g",(double) image->alpha_trait);
        (void) LogMagickEvent(CoderEvent,GetMagickModule(),
              "      image->depth=%.20g",(double) image->depth);
 
@@ -8217,7 +8217,7 @@
 
        for (x=0; x < (ssize_t) image->columns; x++)
        {
-           if (image->matte == MagickFalse ||
+           if (image->alpha_trait != BlendPixelTrait ||
               GetPixelAlpha(image,q) == OpaqueAlpha)
              {
                if (number_opaque < 259)
@@ -8532,7 +8532,7 @@
               {
                 for (i=0; i< (ssize_t) image_colors; i++)
                 {
-                  if ((image->matte == MagickFalse ||
+                  if ((image->alpha_trait != BlendPixelTrait ||
                       image->colormap[i].alpha == GetPixelAlpha(image,q)) &&
                       image->colormap[i].red == GetPixelRed(image,q) &&
                       image->colormap[i].green == GetPixelGreen(image,q) &&
@@ -8991,7 +8991,7 @@
   quantum_info = (QuantumInfo *) NULL;
   number_colors=0;
   image_colors=(int) image->colors;
-  image_matte=image->matte;
+  image_matte=image->alpha_trait;
 
   mng_info->IsPalette=image->storage_class == PseudoClass &&
     image_colors <= 256 && image->colormap != NULL;
@@ -9124,7 +9124,7 @@
      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
         "    height=%.20g",(double) ping_height);
      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
-        "    image_matte=%.20g",(double) image->matte);
+        "    image_matte=%.20g",(double) image->alpha_trait);
      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
         "    image->depth=%.20g",(double) image->depth);
      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
@@ -9423,7 +9423,7 @@
 
       if (ping_color_type == PNG_COLOR_TYPE_GRAY)
         {
-          if (image->matte == MagickFalse && ping_have_non_bw == MagickFalse)
+          if (image->alpha_trait != BlendPixelTrait && ping_have_non_bw == MagickFalse)
              ping_bit_depth=1;
         }
 
@@ -10230,10 +10230,10 @@
         "Cannot write image with defined png:bit-depth or png:color-type.");
     }
 
-  if (image_matte != MagickFalse && image->matte == MagickFalse)
+  if (image_matte != MagickFalse && image->alpha_trait != BlendPixelTrait)
     {
       /* Add an opaque matte channel */
-      image->matte = MagickTrue;
+      image->alpha_trait = MagickTrue;
       (void) SetImageAlpha(image,OpaqueAlpha,exception);
 
       if (logging != MagickFalse)
@@ -11169,7 +11169,7 @@
       mng_info->write_png_depth = 8;
       image->depth = 8;
 
-      if (image->matte == MagickTrue)
+      if (image->alpha_trait == BlendPixelTrait)
         (void) SetImageType(image,TrueColorMatteType,exception);
 
       else
@@ -11184,7 +11184,7 @@
       mng_info->write_png_depth = 8;
       image->depth = 8;
 
-      if (image->matte == MagickTrue)
+      if (image->alpha_trait == BlendPixelTrait)
         (void) SetImageType(image,TrueColorMatteType,exception);
 
       else
@@ -11815,7 +11815,7 @@
 
   status=MagickTrue;
   transparent=image_info->type==GrayscaleMatteType ||
-     image_info->type==TrueColorMatteType || image->matte != MagickFalse;
+     image_info->type==TrueColorMatteType || image->alpha_trait == BlendPixelTrait;
 
   jng_quality=image_info->quality == 0UL ? 75UL : image_info->quality%1000;
 
@@ -11849,7 +11849,7 @@
       if (jpeg_image == (Image *) NULL)
         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
       (void) CopyMagickString(jpeg_image->magick,"JPEG",MaxTextExtent);
-      jpeg_image->matte=MagickFalse;
+      jpeg_image->alpha_trait=UndefinedPixelTrait;
       jpeg_image->quality=jng_alpha_quality;
       jpeg_image_info->type=GrayscaleType;
       (void) SetImageType(jpeg_image,GrayscaleType,exception);
@@ -12530,7 +12530,7 @@
         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
           "      Image depth: %.20g",(double) p->depth);
 
-        if (p->matte)
+        if (p->alpha_trait)
           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
             "      Matte: True");
 
@@ -12624,11 +12624,11 @@
         if (next_image->page.x || next_image->page.y)
           need_defi=MagickTrue;
 
-        if (next_image->matte)
+        if (next_image->alpha_trait)
           need_matte=MagickTrue;
 
         if ((int) next_image->dispose >= BackgroundDispose)
-          if (next_image->matte || next_image->page.x || next_image->page.y ||
+          if (next_image->alpha_trait || next_image->page.x || next_image->page.y ||
               ((next_image->columns < mng_info->page.width) &&
                (next_image->rows < mng_info->page.height)))
             mng_info->need_fram=MagickTrue;
@@ -12647,7 +12647,7 @@
         /*
           check for global palette possibility.
         */
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
            need_local_plte=MagickTrue;
 
         if (need_local_plte == 0)
@@ -13000,7 +13000,7 @@
        Write MNG BACK chunk and global bKGD chunk, if the image is transparent
        or does not cover the entire frame.
      */
-     if (write_mng && (image->matte || image->page.x > 0 ||
+     if (write_mng && (image->alpha_trait || image->page.x > 0 ||
          image->page.y > 0 || (image->page.width &&
          (image->page.width+image->page.x < mng_info->page.width))
          || (image->page.height && (image->page.height+image->page.y
diff --git a/coders/pnm.c b/coders/pnm.c
index 0162ad1..8a4a087 100644
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -379,7 +379,7 @@
               if (LocaleCompare(value,"BLACKANDWHITE_ALPHA") == 0)
                 {
                   SetImageColorspace(image,GRAYColorspace,exception);
-                  image->matte=MagickTrue;
+                  image->alpha_trait=BlendPixelTrait;
                   quantum_type=GrayAlphaQuantum;
                 }
               if (LocaleCompare(value,"GRAYSCALE") == 0)
@@ -390,12 +390,12 @@
               if (LocaleCompare(value,"GRAYSCALE_ALPHA") == 0)
                 {
                   SetImageColorspace(image,GRAYColorspace,exception);
-                  image->matte=MagickTrue;
+                  image->alpha_trait=BlendPixelTrait;
                   quantum_type=GrayAlphaQuantum;
                 }
               if (LocaleCompare(value,"RGB_ALPHA") == 0)
                 {
-                  image->matte=MagickTrue;
+                  image->alpha_trait=BlendPixelTrait;
                   quantum_type=RGBAQuantum;
                 }
               if (LocaleCompare(value,"CMYK") == 0)
@@ -406,7 +406,7 @@
               if (LocaleCompare(value,"CMYK_ALPHA") == 0)
                 {
                   SetImageColorspace(image,CMYKColorspace,exception);
-                  image->matte=MagickTrue;
+                  image->alpha_trait=BlendPixelTrait;
                   quantum_type=CMYKAQuantum;
                 }
             }
@@ -926,7 +926,7 @@
             break;
           }
         }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           channels++;
         extent=channels*(image->depth <= 8 ? 1 : 2)*image->columns;
         quantum_info=AcquireQuantumInfo(image_info,image);
@@ -999,7 +999,7 @@
                       p=PushCharPixel(p,&pixel);
                       SetPixelGray(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushCharPixel(p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1017,7 +1017,7 @@
                       p=PushShortPixel(MSBEndian,p,&pixel);
                       SetPixelGray(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushShortPixel(MSBEndian,p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1046,7 +1046,7 @@
                       p=PushCharPixel(p,&pixel);
                       SetPixelBlack(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushCharPixel(p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1070,7 +1070,7 @@
                       p=PushShortPixel(MSBEndian,p,&pixel);
                       SetPixelBlack(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushShortPixel(MSBEndian,p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1096,7 +1096,7 @@
                       p=PushCharPixel(p,&pixel);
                       SetPixelBlue(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushCharPixel(p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1118,7 +1118,7 @@
                       p=PushShortPixel(MSBEndian,p,&pixel);
                       SetPixelBlue(image,ScaleAnyToQuantum(pixel,range),q);
                       SetPixelAlpha(image,OpaqueAlpha,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           p=PushShortPixel(MSBEndian,p,&pixel);
                           SetPixelAlpha(image,ScaleAnyToQuantum(pixel,range),q);
@@ -1577,14 +1577,14 @@
           default:
           {
             quantum_type=RGBQuantum;
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               quantum_type=RGBAQuantum;
             packet_size=3;
             (void) CopyMagickString(type,"RGB",MaxTextExtent);
             break;
           }
         }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             packet_size++;
             (void) ConcatenateMagickString(type,"_ALPHA",MaxTextExtent);
@@ -2018,7 +2018,7 @@
                     {
                       pixel=ScaleQuantumToAny(GetPixelIntensity(image,p),range);
                       q=PopCharPixel((unsigned char) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=(unsigned char) ScaleQuantumToAny(
                             GetPixelAlpha(image,p),range);
@@ -2031,7 +2031,7 @@
                     {
                       pixel=ScaleQuantumToAny(GetPixelIntensity(image,p),range);
                       q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=(unsigned char) ScaleQuantumToAny(
                             GetPixelAlpha(image,p),range);
@@ -2055,7 +2055,7 @@
                       q=PopCharPixel((unsigned char) pixel,q);
                       pixel=ScaleQuantumToAny(GetPixelBlack(image,p),range);
                       q=PopCharPixel((unsigned char) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=ScaleQuantumToAny(GetPixelAlpha(image,p),range);
                           q=PopCharPixel((unsigned char) pixel,q);
@@ -2073,7 +2073,7 @@
                       q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
                       pixel=ScaleQuantumToAny(GetPixelBlack(image,p),range);
                       q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=ScaleQuantumToAny(GetPixelAlpha(image,p),range);
                           q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
@@ -2093,7 +2093,7 @@
                       q=PopCharPixel((unsigned char) pixel,q);
                       pixel=ScaleQuantumToAny(GetPixelBlue(image,p),range);
                       q=PopCharPixel((unsigned char) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=ScaleQuantumToAny(GetPixelAlpha(image,p),range);
                           q=PopCharPixel((unsigned char) pixel,q);
@@ -2109,7 +2109,7 @@
                       q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
                       pixel=ScaleQuantumToAny(GetPixelBlue(image,p),range);
                       q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
-                      if (image->matte != MagickFalse)
+                      if (image->alpha_trait == BlendPixelTrait)
                         {
                           pixel=ScaleQuantumToAny(GetPixelAlpha(image,p),range);
                           q=PopShortPixel(MSBEndian,(unsigned short) pixel,q);
diff --git a/coders/ps.c b/coders/ps.c
index fba33ec..fb563c8 100644
--- a/coders/ps.c
+++ b/coders/ps.c
@@ -1050,7 +1050,7 @@
 {
 #define WriteRunlengthPacket(image,pixel,length,p) \
 { \
-  if ((image->matte != MagickFalse) && \
+  if ((image->alpha_trait == BlendPixelTrait) && \
       (GetPixelAlpha(image,p) == (Quantum) TransparentAlpha)) \
     { \
       q=PopHexPixel(hex_digits,0xff,q); \
@@ -1880,7 +1880,7 @@
       }
     else
       if ((image->storage_class == DirectClass) ||
-          (image->colors > 256) || (image->matte != MagickFalse))
+          (image->colors > 256) || (image->alpha_trait == BlendPixelTrait))
         {
           /*
             Dump DirectClass image.
@@ -1965,7 +1965,7 @@
                   break;
                 for (x=0; x < (ssize_t) image->columns; x++)
                 {
-                  if ((image->matte != MagickFalse) &&
+                  if ((image->alpha_trait == BlendPixelTrait) &&
                       (GetPixelAlpha(image,p) == (Quantum) TransparentAlpha))
                     {
                       q=PopHexPixel(hex_digits,0xff,q);
diff --git a/coders/ps2.c b/coders/ps2.c
index ea668f4..06e19c3 100644
--- a/coders/ps2.c
+++ b/coders/ps2.c
@@ -841,7 +841,7 @@
       }
     else
       if ((image->storage_class == DirectClass) || (image->colors > 256) ||
-          (compression == JPEGCompression) || (image->matte != MagickFalse))
+          (compression == JPEGCompression) || (image->alpha_trait == BlendPixelTrait))
         {
           (void) FormatLocaleString(buffer,MaxTextExtent,"%.20g %.20g\n0\n%d\n",
             (double) image->columns,(double) image->rows,(int)
@@ -888,7 +888,7 @@
                   break;
                 for (x=0; x < (ssize_t) image->columns; x++)
                 {
-                  if ((image->matte != MagickFalse) &&
+                  if ((image->alpha_trait == BlendPixelTrait) &&
                       (GetPixelAlpha(image,p) == (Quantum) TransparentAlpha))
                     {
                       *q++=ScaleQuantumToChar(QuantumRange);
@@ -942,7 +942,7 @@
                   break;
                 for (x=0; x < (ssize_t) image->columns; x++)
                 {
-                  if ((image->matte != MagickFalse) &&
+                  if ((image->alpha_trait == BlendPixelTrait) &&
                       (GetPixelAlpha(image,p) == (Quantum) TransparentAlpha))
                     {
                       Ascii85Encode(image,ScaleQuantumToChar((Quantum)
diff --git a/coders/ps3.c b/coders/ps3.c
index f87ff55..3cf1f45 100644
--- a/coders/ps3.c
+++ b/coders/ps3.c
@@ -460,7 +460,7 @@
   assert(image->signature == MagickSignature);
   if (image->debug != MagickFalse)
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
-  assert(image->matte != MagickFalse);
+  assert(image->alpha_trait == BlendPixelTrait);
   status=MagickTrue;
   /*
     Note BeginData DSC comment for update later.
@@ -521,7 +521,7 @@
     ThrowWriterException(CoderError,exception->reason);
   (void) SetImageType(mask_image,BilevelType,exception);
   (void) SetImageType(mask_image,PaletteType,exception);
-  mask_image->matte=MagickFalse;
+  mask_image->alpha_trait=UndefinedPixelTrait;
   pixels=(unsigned char *) NULL;
   length=0;
   switch (compression)
@@ -881,7 +881,7 @@
     case Group4Compression:
     { 
       if ((IsImageMonochrome(image,exception) == MagickFalse) ||
-          (image->matte != MagickFalse))
+          (image->alpha_trait == BlendPixelTrait))
         compression=RLECompression;
       break;
     }
@@ -1150,7 +1150,7 @@
     /*
       Image mask.
     */
-    if ((image->matte != MagickFalse) &&
+    if ((image->alpha_trait == BlendPixelTrait) &&
         (WritePS3MaskImage(image_info,image,compression,exception) == MagickFalse))
       {
         (void) CloseBlob(image);
@@ -1224,7 +1224,7 @@
     /*
       Masked image?
     */
-    (void) WriteBlobString(image,image->matte != MagickFalse ?
+    (void) WriteBlobString(image,image->alpha_trait == BlendPixelTrait ?
       "true\n" : "false\n");
     /*
       Render with imagemask operator?
diff --git a/coders/psd.c b/coders/psd.c
index 4c89e28..4e8040b 100644
--- a/coders/psd.c
+++ b/coders/psd.c
@@ -697,7 +697,7 @@
           if (image->colorspace == CMYKColorspace)
             SetPixelBlack(image,pixel,q);
           else
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,pixel,q);
           break;
         }
@@ -706,7 +706,7 @@
           if ((IssRGBCompatibleColorspace(image->colorspace) != MagickFalse) &&
               (channels > 3))
             break;
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             SetPixelAlpha(image,pixel,q);
           break;
         }
@@ -832,7 +832,7 @@
       image=DestroyImageList(image);
       return((Image *) NULL);
     }
-  image->matte=psd_info.channels >= 4 ? MagickTrue : MagickFalse;
+  image->alpha_trait=psd_info.channels >= 4 ? MagickTrue : MagickFalse;
   if (psd_info.mode == LabMode)
     SetImageColorspace(image,LabColorspace,exception);
   psd_info.color_channels=3;
@@ -840,7 +840,7 @@
     {
       psd_info.color_channels=4;
       SetImageColorspace(image,CMYKColorspace,exception);
-      image->matte=psd_info.channels >= 5 ? MagickTrue : MagickFalse;
+      image->alpha_trait=psd_info.channels >= 5 ? MagickTrue : MagickFalse;
     }
   if ((psd_info.mode == BitmapMode) || (psd_info.mode == GrayscaleMode) ||
       (psd_info.mode == DuotoneMode))
@@ -848,13 +848,13 @@
       psd_info.color_channels=1;
       if (AcquireImageColormap(image,256,exception) == MagickFalse)
         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
-      image->matte=psd_info.channels >= 2 ? MagickTrue : MagickFalse;
+      image->alpha_trait=psd_info.channels >= 2 ? MagickTrue : MagickFalse;
       if (image->debug != MagickFalse)
         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
           "  Image colormap allocated");
       SetImageColorspace(image,GRAYColorspace,exception);
     }
-  image->matte=MagickFalse;
+  image->alpha_trait=UndefinedPixelTrait;
   /*
     Read PSD raster colormap only present for indexed and duotone images.
   */
@@ -892,7 +892,7 @@
           for (i=0; i < (ssize_t) image->colors; i++)
             image->colormap[i].blue=ScaleCharToQuantum((unsigned char)
               ReadBlobByte(image));
-          image->matte=MagickFalse;
+          image->alpha_trait=UndefinedPixelTrait;
         }
     }
   length=ReadBlobMSBLong(image);
@@ -989,11 +989,11 @@
           MagickOffsetType
             layer_offset;
 
-          image->matte=psd_info.channels > psd_info.color_channels ?  MagickTrue : MagickFalse;
+          image->alpha_trait=psd_info.channels > psd_info.color_channels ?  MagickTrue : MagickFalse;
 
           if (image->debug != MagickFalse)
             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
-              image->matte ? "  image has matte" : "  image has no matte");
+              image->alpha_trait ? "  image has matte" : "  image has no matte");
 
           layer_offset=offset+length;
           number_layers=(short) ReadBlobMSBShort(image);
@@ -1045,7 +1045,7 @@
                   quantum;
 
                 if (layer_info[i].channels == psd_info.color_channels)
-                  image->matte=MagickFalse;
+                  image->alpha_trait=UndefinedPixelTrait;
                 quantum=psd_info.version == 1 ? 4UL : 8UL;
                 if (DiscardBlobBytes(image,length-20-quantum) == MagickFalse)
                   ThrowFileException(exception,CorruptImageError,
@@ -1242,7 +1242,7 @@
               SetImageColorspace(layer_info[i].image,GRAYColorspace,exception);
             for (j=0; j < (ssize_t) layer_info[i].channels; j++)
               if (layer_info[i].channel_info[j].type == -1)
-                layer_info[i].image->matte=MagickTrue;
+                layer_info[i].image->alpha_trait=BlendPixelTrait;
             /*
               Set up some hidden attributes for folks that need them.
             */
@@ -1831,14 +1831,14 @@
           (void) WriteBlobMSBShort(image,1);
           WritePackbitsLength(psd_info,image_info,image,next_image,
             compact_pixels,GrayQuantum,exception);
-          if (next_image->matte != MagickFalse)
+          if (next_image->alpha_trait == BlendPixelTrait)
             WritePackbitsLength(psd_info,image_info,image,next_image,
               compact_pixels,AlphaQuantum,exception);
         }
       WriteOneChannel(psd_info,image_info,image,next_image,compact_pixels,
         GrayQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
         MagickFalse,exception);
-      if (next_image->matte != MagickFalse)
+      if (next_image->alpha_trait == BlendPixelTrait)
         WriteOneChannel(psd_info,image_info,image,next_image,compact_pixels,
           AlphaQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
           MagickFalse,exception);
@@ -1855,14 +1855,14 @@
             (void) WriteBlobMSBShort(image,1);
             WritePackbitsLength(psd_info,image_info,image,next_image,
               compact_pixels,IndexQuantum,exception);
-            if (next_image->matte != MagickFalse)
+            if (next_image->alpha_trait == BlendPixelTrait)
               WritePackbitsLength(psd_info,image_info,image,next_image,
                 compact_pixels,AlphaQuantum,exception);
           }
         WriteOneChannel(psd_info,image_info,image,next_image,compact_pixels,
           IndexQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
           MagickFalse,exception);
-        if (next_image->matte != MagickFalse)
+        if (next_image->alpha_trait == BlendPixelTrait)
           WriteOneChannel(psd_info,image_info,image,next_image,compact_pixels,
             AlphaQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
             MagickFalse,exception);
@@ -1887,7 +1887,7 @@
             if (next_image->colorspace == CMYKColorspace)
               WritePackbitsLength(psd_info,image_info,image,next_image,
                 compact_pixels,BlackQuantum,exception);
-            if (next_image->matte != MagickFalse)
+            if (next_image->alpha_trait == BlendPixelTrait)
               WritePackbitsLength(psd_info,image_info,image,next_image,
                 compact_pixels,AlphaQuantum,exception);
           }
@@ -1909,7 +1909,7 @@
             BlackQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
             MagickFalse,exception);
         (void) SetImageProgress(image,SaveImagesTag,4,6);
-        if (next_image->matte != MagickFalse)
+        if (next_image->alpha_trait == BlendPixelTrait)
           WriteOneChannel(psd_info,image_info,image,next_image,compact_pixels,
             AlphaQuantum,(i++ == 0) || (separate != MagickFalse) ? MagickTrue :
             MagickFalse,exception);
@@ -2127,7 +2127,7 @@
   if (status == MagickFalse)
     return(status);
   packet_size=(size_t) (image->depth > 8 ? 6 : 3);
-  if (image->matte != MagickFalse)
+  if (image->alpha_trait == BlendPixelTrait)
     packet_size+=image->depth > 8 ? 2 : 1;
   psd_info.version=1;
   if ((LocaleCompare(image_info->magick,"PSB") == 0) ||
@@ -2138,16 +2138,16 @@
   for (i=1; i <= 6; i++)
     (void) WriteBlobByte(image, 0);  /* 6 bytes of reserved */
   if (IsImageGray(image,exception) != MagickFalse)
-    num_channels=(image->matte != MagickFalse ? 2UL : 1UL);
+    num_channels=(image->alpha_trait == BlendPixelTrait ? 2UL : 1UL);
   else
     if (image->storage_class == PseudoClass)
-      num_channels=(image->matte != MagickFalse ? 2UL : 1UL);
+      num_channels=(image->alpha_trait == BlendPixelTrait ? 2UL : 1UL);
     else
       {
         if (image->colorspace != CMYKColorspace)
-          num_channels=(image->matte != MagickFalse ? 4UL : 3UL);
+          num_channels=(image->alpha_trait == BlendPixelTrait ? 4UL : 3UL);
         else
-          num_channels=(image->matte != MagickFalse ? 5UL : 4UL);
+          num_channels=(image->alpha_trait == BlendPixelTrait ? 5UL : 4UL);
       }
   (void) WriteBlobMSBShort(image,(unsigned short) num_channels);
   (void) WriteBlobMSBLong(image,(unsigned int) image->rows);
@@ -2250,22 +2250,22 @@
   layer_count=0;
   layer_info_size=2;
   base_image=GetNextImageInList(image);
-  if ((image->matte != MagickFalse) && (base_image == (Image *) NULL))
+  if ((image->alpha_trait == BlendPixelTrait) && (base_image == (Image *) NULL))
     base_image=image;
   next_image=base_image;
   while ( next_image != NULL )
   {
     packet_size=next_image->depth > 8 ? 2UL : 1UL;
     if (IsImageGray(next_image,exception) != MagickFalse)
-      num_channels=next_image->matte != MagickFalse ? 2UL : 1UL;
+      num_channels=next_image->alpha_trait == BlendPixelTrait ? 2UL : 1UL;
     else
       if (next_image->storage_class == PseudoClass)
-        num_channels=next_image->matte != MagickFalse ? 2UL : 1UL;
+        num_channels=next_image->alpha_trait == BlendPixelTrait ? 2UL : 1UL;
       else
         if (next_image->colorspace != CMYKColorspace)
-          num_channels=next_image->matte != MagickFalse ? 4UL : 3UL;
+          num_channels=next_image->alpha_trait == BlendPixelTrait ? 4UL : 3UL;
         else
-          num_channels=next_image->matte != MagickFalse ? 5UL : 4UL;
+          num_channels=next_image->alpha_trait == BlendPixelTrait ? 5UL : 4UL;
     channelLength=(size_t) (next_image->columns*next_image->rows*packet_size+2);
     layer_info_size+=(size_t) (4*4+2+num_channels*6+(psd_info.version == 1 ? 8 :
       16)+4*1+4+num_channels*channelLength);
@@ -2317,10 +2317,10 @@
             (next_image->storage_class == PseudoClass))
           {
              (void) WriteBlobMSBShort(image,(unsigned short)
-               (next_image->matte != MagickFalse ? 2 : 1));
+               (next_image->alpha_trait == BlendPixelTrait ? 2 : 1));
              (void) WriteBlobMSBShort(image,0);
              (void) SetPSDSize(&psd_info,image,channel_size);
-             if (next_image->matte != MagickFalse)
+             if (next_image->alpha_trait == BlendPixelTrait)
                {
                  (void) WriteBlobMSBShort(image,(unsigned short) -1);
                  (void) SetPSDSize(&psd_info,image,channel_size);
@@ -2330,14 +2330,14 @@
             if (next_image->colorspace != CMYKColorspace)
               {
                 (void) WriteBlobMSBShort(image,(unsigned short)
-                  (next_image->matte != MagickFalse ? 4 : 3));
+                  (next_image->alpha_trait == BlendPixelTrait ? 4 : 3));
                (void) WriteBlobMSBShort(image,0);
                (void) SetPSDSize(&psd_info,image,channel_size);
                (void) WriteBlobMSBShort(image,1);
                (void) SetPSDSize(&psd_info,image,channel_size);
                (void) WriteBlobMSBShort(image,2);
                (void) SetPSDSize(&psd_info,image,channel_size);
-               if (next_image->matte!= MagickFalse )
+               if (next_image->alpha_trait == BlendPixelTrait)
                  {
                    (void) WriteBlobMSBShort(image,(unsigned short) -1);
                    (void) SetPSDSize(&psd_info,image,channel_size);
@@ -2346,7 +2346,7 @@
            else
              {
                (void) WriteBlobMSBShort(image,(unsigned short)
-                 (next_image->matte ? 5 : 4));
+                 (next_image->alpha_trait ? 5 : 4));
                (void) WriteBlobMSBShort(image,0);
                (void) SetPSDSize(&psd_info,image,channel_size);
                (void) WriteBlobMSBShort(image,1);
@@ -2355,7 +2355,7 @@
                (void) SetPSDSize(&psd_info,image,channel_size);
                (void) WriteBlobMSBShort(image,3);
                (void) SetPSDSize(&psd_info,image,channel_size);
-               if (next_image->matte)
+               if (next_image->alpha_trait)
                  {
                    (void) WriteBlobMSBShort(image,(unsigned short) -1);
                    (void) SetPSDSize(&psd_info,image,channel_size);
diff --git a/coders/rgb.c b/coders/rgb.c
index 0859a0d..6412699 100644
--- a/coders/rgb.c
+++ b/coders/rgb.c
@@ -167,13 +167,13 @@
   if (LocaleCompare(image_info->magick,"RGBA") == 0)
     {
       quantum_type=RGBAQuantum;
-      image->matte=MagickTrue;
-      canvas_image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
+      canvas_image->alpha_trait=BlendPixelTrait;
     }
   if (LocaleCompare(image_info->magick,"RGBO") == 0)
     {
       quantum_type=RGBOQuantum;
-      canvas_image->matte=MagickTrue;
+      canvas_image->alpha_trait=BlendPixelTrait;
     }
   if (image_info->number_scenes != 0)
     while (image->scene < image_info->scene)
@@ -254,7 +254,7 @@
                 SetPixelGreen(image,GetPixelGreen(canvas_image,p),q);
                 SetPixelBlue(image,GetPixelBlue(canvas_image,p),q);
                 SetPixelAlpha(image,OpaqueAlpha,q);
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                   SetPixelAlpha(image,GetPixelAlpha(canvas_image,p),q);
                 p+=GetPixelChannels(canvas_image);
                 q+=GetPixelChannels(image);
@@ -311,7 +311,7 @@
                 "UnexpectedEndOfFile",image->filename);
               break;
             }
-          for (i=0; i < (ssize_t) (image->matte != MagickFalse ? 4 : 3); i++)
+          for (i=0; i < (ssize_t) (image->alpha_trait == BlendPixelTrait ? 4 : 3); i++)
           {
             quantum_type=quantum_types[i];
             q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,
@@ -550,7 +550,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             for (y=0; y < (ssize_t) image->extract_info.height; y++)
             {
@@ -830,7 +830,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             (void) CloseBlob(image);
             AppendImageFormat("A",image->filename);
@@ -1111,7 +1111,7 @@
     if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
       (void) TransformImageColorspace(image,sRGBColorspace,exception);
     if ((LocaleCompare(image_info->magick,"RGBA") == 0) &&
-        (image->matte == MagickFalse))
+        (image->alpha_trait != BlendPixelTrait))
       (void) SetImageAlphaChannel(image,OpaqueAlphaChannel,exception);
     quantum_info=AcquireQuantumInfo(image_info,image);
     if (quantum_info == (QuantumInfo *) NULL)
diff --git a/coders/rla.c b/coders/rla.c
index 843fd6f..1579a0d 100644
--- a/coders/rla.c
+++ b/coders/rla.c
@@ -252,7 +252,7 @@
   /*
     Initialize image structure.
   */
-  image->matte=rla_info.number_matte_channels != 0 ? MagickTrue : MagickFalse;
+  image->alpha_trait=rla_info.number_matte_channels != 0 ? MagickTrue : MagickFalse;
   image->columns=1UL*rla_info.active_window.right-rla_info.active_window.left+1;
   image->rows=1UL*rla_info.active_window.top-rla_info.active_window.bottom+1;
   if (image_info->ping != MagickFalse)
diff --git a/coders/rle.c b/coders/rle.c
index f28a967..506447d 100644
--- a/coders/rle.c
+++ b/coders/rle.c
@@ -212,7 +212,7 @@
     image->columns=ReadBlobLSBShort(image);
     image->rows=ReadBlobLSBShort(image);
     flags=(MagickStatusType) ReadBlobByte(image);
-    image->matte=flags & 0x04 ? MagickTrue : MagickFalse;
+    image->alpha_trait=flags & 0x04 ? MagickTrue : MagickFalse;
     number_planes=1UL*ReadBlobByte(image);
     bits_per_pixel=1UL*ReadBlobByte(image);
     number_colormaps=1UL*ReadBlobByte(image);
@@ -287,7 +287,7 @@
     /*
       Allocate RLE pixels.
     */
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       number_planes++;
     number_pixels=(MagickSizeType) image->columns*image->rows;
     if ((number_pixels*number_planes) != (size_t) (number_pixels*number_planes))
@@ -307,7 +307,7 @@
         p=rle_pixels;
         for (i=0; i < (ssize_t) number_pixels; i++)
         {
-          if (image->matte == MagickFalse)
+          if (image->alpha_trait != BlendPixelTrait)
             for (j=0; j < (ssize_t) number_planes; j++)
               *p++=background_color[j];
           else
@@ -445,7 +445,7 @@
             SetPixelRed(image,ScaleCharToQuantum(*p++),q);
             SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
             SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
             q+=GetPixelChannels(image);
           }
@@ -490,7 +490,7 @@
               p++;
             }
         p=rle_pixels;
-        if (image->matte == MagickFalse)
+        if (image->alpha_trait != BlendPixelTrait)
           {
             /*
               Convert raster image to PseudoClass pixel packets.
diff --git a/coders/sgi.c b/coders/sgi.c
index 83db3a8..bfcd702 100644
--- a/coders/sgi.c
+++ b/coders/sgi.c
@@ -530,7 +530,7 @@
     /*
       Initialize image structure.
     */
-    image->matte=iris_info.depth == 4 ? MagickTrue : MagickFalse;
+    image->alpha_trait=iris_info.depth == 4 ? MagickTrue : MagickFalse;
     image->columns=iris_info.columns;
     image->rows=iris_info.rows;
     /*
@@ -558,7 +558,7 @@
                 SetPixelBlue(image,ScaleShortToQuantum((unsigned short)
                   ((*(p+4) << 8) | (*(p+5)))),q);
                 SetPixelAlpha(image,OpaqueAlpha,q);
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                   SetPixelAlpha(image,ScaleShortToQuantum((unsigned short)
                     ((*(p+6) << 8) | (*(p+7)))),q);
                 p+=8;
@@ -588,7 +588,7 @@
               SetPixelGreen(image,ScaleCharToQuantum(*(p+1)),q);
               SetPixelBlue(image,ScaleCharToQuantum(*(p+2)),q);
               SetPixelAlpha(image,OpaqueAlpha,q);
-              if (image->matte != MagickFalse)
+              if (image->alpha_trait == BlendPixelTrait)
                 SetPixelAlpha(image,ScaleCharToQuantum(*(p+3)),q);
               p+=4;
               q+=GetPixelChannels(image);
@@ -924,7 +924,7 @@
     iris_info.dimension=3;
     iris_info.columns=(unsigned short) image->columns;
     iris_info.rows=(unsigned short) image->rows;
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       iris_info.depth=4;
     else
       {
diff --git a/coders/sun.c b/coders/sun.c
index 56f4a64..e5b220f 100644
--- a/coders/sun.c
+++ b/coders/sun.c
@@ -383,7 +383,7 @@
       default:
         ThrowReaderException(CoderError,"ColormapTypeNotSupported");
     }
-    image->matte=sun_info.depth == 32 ? MagickTrue : MagickFalse;
+    image->alpha_trait=sun_info.depth == 32 ? MagickTrue : MagickFalse;
     image->columns=sun_info.width;
     image->rows=sun_info.height;
     if (image_info->ping != MagickFalse)
@@ -510,7 +510,7 @@
             bytes_per_pixel;
 
           bytes_per_pixel=3;
-          if (image->matte != MagickFalse)
+          if (image->alpha_trait == BlendPixelTrait)
             bytes_per_pixel++;
           length=image->rows*((bytes_per_line*image->columns)+
             image->columns % 2);
@@ -525,7 +525,7 @@
               break;
             for (x=0; x < (ssize_t) image->columns; x++)
             {
-              if (image->matte != MagickFalse)
+              if (image->alpha_trait == BlendPixelTrait)
                 SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
               if (sun_info.type == RT_STANDARD)
                 {
@@ -781,8 +781,8 @@
         /*
           Full color SUN raster.
         */
-        sun_info.depth=(unsigned int) image->matte ? 32U : 24U;
-        sun_info.length=(unsigned int) ((image->matte ? 4 : 3)*number_pixels);
+        sun_info.depth=(unsigned int) image->alpha_trait ? 32U : 24U;
+        sun_info.length=(unsigned int) ((image->alpha_trait ? 4 : 3)*number_pixels);
         sun_info.length+=sun_info.length & 0x01 ? (unsigned int) image->rows :
           0;
       }
@@ -842,7 +842,7 @@
           Allocate memory for pixels.
         */
         bytes_per_pixel=3;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           bytes_per_pixel++;
         length=image->columns;
         pixels=(unsigned char *) AcquireQuantumMemory(length,4*sizeof(*pixels));
@@ -859,7 +859,7 @@
           q=pixels;
           for (x=0; x < (ssize_t) image->columns; x++)
           {
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
diff --git a/coders/svg.c b/coders/svg.c
index ab6d4a7..0b2a0f4 100644
--- a/coders/svg.c
+++ b/coders/svg.c
@@ -2935,7 +2935,7 @@
         image->columns=gdk_pixbuf_get_width(pixel_info);
         image->rows=gdk_pixbuf_get_height(pixel_info);
 #endif
-        image->matte=MagickTrue;
+        image->alpha_trait=BlendPixelTrait;
         SetImageProperty(image,"svg:base-uri",
           rsvg_handle_get_base_uri(svg_handle),exception);
         if ((image->columns == 0) || (image->rows == 0))
diff --git a/coders/tga.c b/coders/tga.c
index 34c4563..b2e7e46 100644
--- a/coders/tga.c
+++ b/coders/tga.c
@@ -227,7 +227,7 @@
   image->columns=tga_info.width;
   image->rows=tga_info.height;
   alpha_bits=(tga_info.attributes & 0x0FU);
-  image->matte=(alpha_bits > 0) || (tga_info.bits_per_pixel == 32) ?
+  image->alpha_trait=(alpha_bits > 0) || (tga_info.bits_per_pixel == 32) ?
     MagickTrue : MagickFalse;
   if ((tga_info.image_type != TGAColormap) &&
       (tga_info.image_type != TGARLEColormap))
@@ -423,7 +423,7 @@
             pixel.green=ScaleAnyToQuantum((1UL*(k & 0x03) << 3)+
               (1UL*(j & 0xe0) >> 5),range);
             pixel.blue=ScaleAnyToQuantum(1UL*(j & 0x1f),range);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               pixel.alpha=(k & 0x80) == 0 ? (Quantum) OpaqueAlpha : (Quantum)
                 TransparentAlpha; 
             if (image->storage_class == PseudoClass)
@@ -463,7 +463,7 @@
       SetPixelRed(image,pixel.red,q);
       SetPixelGreen(image,pixel.green,q);
       SetPixelBlue(image,pixel.blue,q);
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         SetPixelAlpha(image,pixel.alpha,q);
       q+=GetPixelChannels(image);
     }
@@ -717,7 +717,7 @@
   if ((image_info->type != TrueColorType) &&
       (image_info->type != TrueColorMatteType) &&
       (image_info->type != PaletteType) &&
-      (image->matte == MagickFalse) &&
+      (image->alpha_trait != BlendPixelTrait) &&
       (IsImageGray(image,exception) != MagickFalse))
     targa_info.image_type=TargaMonochrome;
   else
@@ -728,7 +728,7 @@
         */
         targa_info.image_type=TargaRGB;
         targa_info.bits_per_pixel=24;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             targa_info.bits_per_pixel=32;
             targa_info.attributes=8;  /* # of alpha bits */
@@ -811,7 +811,7 @@
             *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
             *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
             *q++=ScaleQuantumToChar(GetPixelRed(image,p));
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               *q++=(unsigned char) ScaleQuantumToChar(GetPixelAlpha(image,p));
           }
       p+=GetPixelChannels(image);
diff --git a/coders/thumbnail.c b/coders/thumbnail.c
index 2ae47db..8c044b9 100644
--- a/coders/thumbnail.c
+++ b/coders/thumbnail.c
@@ -205,7 +205,7 @@
     length,exception);
   if (thumbnail_image == (Image *) NULL)
     return(MagickFalse);
-  (void) SetImageType(thumbnail_image,thumbnail_image->matte == MagickFalse ?
+  (void) SetImageType(thumbnail_image,thumbnail_image->alpha_trait != BlendPixelTrait ?
     TrueColorType : TrueColorMatteType,exception);
   (void) CopyMagickString(thumbnail_image->filename,image->filename,
     MaxTextExtent);
diff --git a/coders/tiff.c b/coders/tiff.c
index 73a88fb..302219d 100644
--- a/coders/tiff.c
+++ b/coders/tiff.c
@@ -1204,12 +1204,12 @@
     if (extra_samples == 0)
       {
         if ((samples_per_pixel == 4) && (photometric == PHOTOMETRIC_RGB))
-          image->matte=MagickTrue;
+          image->alpha_trait=BlendPixelTrait;
       }
     else
       for (i=0; i < extra_samples; i++)
       {
-        image->matte=MagickTrue;
+        image->alpha_trait=BlendPixelTrait;
         if (sample_info[i] == EXTRASAMPLE_ASSOCALPHA)
           SetQuantumAlphaType(quantum_info,DisassociatedQuantumAlpha);
       }
@@ -1217,7 +1217,7 @@
     if (option != (const char *) NULL)
       associated_alpha=LocaleCompare(option,"associated") == 0 ? MagickTrue :
         MagickFalse;
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       (void) SetImageProperty(image,"tiff:alpha",
         associated_alpha != MagickFalse ? "associated" : "unassociated",
         exception);
@@ -1331,7 +1331,7 @@
           }
         quantum_type=IndexQuantum;
         pad=(size_t) MagickMax((size_t) samples_per_pixel-1,0);
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             if (image->storage_class != PseudoClass)
               {
@@ -1394,7 +1394,7 @@
         */
         pad=(size_t) MagickMax((size_t) samples_per_pixel-3,0);
         quantum_type=RGBQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             quantum_type=RGBAQuantum;
             pad=(size_t) MagickMax((size_t) samples_per_pixel-4,0);
@@ -1403,7 +1403,7 @@
           {
             pad=(size_t) MagickMax((size_t) samples_per_pixel-4,0);
             quantum_type=CMYKQuantum;
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               {
                 quantum_type=CMYKAQuantum;
                 pad=(size_t) MagickMax((size_t) samples_per_pixel-5,0);
@@ -1538,7 +1538,7 @@
               (TIFFGetG(*p))),q);
             SetPixelBlue(image,ScaleCharToQuantum((unsigned char)
               (TIFFGetB(*p))),q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,ScaleCharToQuantum((unsigned char)
                 (TIFFGetA(*p))),q);
             p++;
@@ -1623,7 +1623,7 @@
               x);
             for (row=rows_remaining; row > 0; row--)
             {
-              if (image->matte != MagickFalse)
+              if (image->alpha_trait == BlendPixelTrait)
                 for (column=columns_remaining; column > 0; column--)
                 {
                   SetPixelRed(image,ScaleCharToQuantum((unsigned char)
@@ -1718,7 +1718,7 @@
               TIFFGetG(*p)),q);
             SetPixelBlue(image,ScaleCharToQuantum((unsigned char)
               TIFFGetB(*p)),q);
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               SetPixelAlpha(image,ScaleCharToQuantum((unsigned char)
                 TIFFGetA(*p)),q);
             p--;
@@ -2932,7 +2932,7 @@
                   MagickFalse ? PHOTOMETRIC_MINISWHITE :
                   PHOTOMETRIC_MINISBLACK);
                 (void) TIFFSetField(tiff,TIFFTAG_SAMPLESPERPIXEL,1);
-                if ((image_info->depth == 0) && (image->matte == MagickFalse) &&
+                if ((image_info->depth == 0) && (image->alpha_trait != BlendPixelTrait) &&
                     (IsImageMonochrome(image,exception) != MagickFalse))
                   {
                     status=SetQuantumDepth(image,quantum_info,1);
@@ -3008,7 +3008,7 @@
     (void) TIFFSetField(tiff,TIFFTAG_COMPRESSION,compress_tag);
     (void) TIFFSetField(tiff,TIFFTAG_FILLORDER,endian);
     (void) TIFFSetField(tiff,TIFFTAG_BITSPERSAMPLE,quantum_info->depth);
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       {
         uint16
           extra_samples,
@@ -3272,7 +3272,7 @@
           default:
           {
             quantum_type=RGBQuantum;
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               quantum_type=RGBAQuantum;
             for (y=0; y < (ssize_t) image->rows; y++)
             {
@@ -3360,7 +3360,7 @@
                 if (status == MagickFalse)
                   break;
               }
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               for (y=0; y < (ssize_t) image->rows; y++)
               {
                 register const Quantum
@@ -3391,7 +3391,7 @@
           CMYK TIFF image.
         */
         quantum_type=CMYKQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           quantum_type=CMYKAQuantum;
         if (image->colorspace != CMYKColorspace)
           (void) TransformImageColorspace(image,CMYKColorspace,exception);
@@ -3456,7 +3456,7 @@
           Convert PseudoClass packets to contiguous grayscale scanlines.
         */
         quantum_type=IndexQuantum;
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             if (photometric != PHOTOMETRIC_PALETTE)
               quantum_type=GrayAlphaQuantum;
diff --git a/coders/tile.c b/coders/tile.c
index 224a171..1a2f281 100644
--- a/coders/tile.c
+++ b/coders/tile.c
@@ -117,8 +117,8 @@
   if (*image_info->filename == '\0')
     ThrowReaderException(OptionError,"MustSpecifyAnImageName");
   image->colorspace=tile_image->colorspace;
-  image->matte=tile_image->matte;
-  if (image->matte != MagickFalse)
+  image->alpha_trait=tile_image->alpha_trait;
+  if (image->alpha_trait == BlendPixelTrait)
     (void) SetImageBackgroundColor(image,exception);
   (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
   if (LocaleCompare(tile_image->magick,"PATTERN") == 0)
diff --git a/coders/txt.c b/coders/txt.c
index db31a0d..0ea542e 100644
--- a/coders/txt.c
+++ b/coders/txt.c
@@ -432,11 +432,11 @@
     image->depth=depth;
     LocaleLower(colorspace);
     i=(ssize_t) strlen(colorspace)-1;
-    image->matte=MagickFalse;
+    image->alpha_trait=UndefinedPixelTrait;
     if ((i > 0) && (colorspace[i] == 'a'))
       {
         colorspace[i]='\0';
-        image->matte=MagickTrue;
+        image->alpha_trait=BlendPixelTrait;
       }
     type=ParseCommandOption(MagickColorspaceOptions,MagickFalse,colorspace);
     if (type < 0)
@@ -455,7 +455,7 @@
         {
           case GRAYColorspace:
           {
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               {
                 count=(ssize_t) sscanf(text,"%ld,%ld: (%lf,%lf",&x_offset,
                   &y_offset,&pixel.red,&pixel.alpha);
@@ -471,7 +471,7 @@
           }
           case CMYKColorspace:
           {
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               {
                 count=(ssize_t) sscanf(text,"%ld,%ld: (%lf,%lf,%lf,%lf,%lf",
                   &x_offset,&y_offset,&pixel.red,&pixel.green,&pixel.blue,
@@ -484,7 +484,7 @@
           }
           default:
           {
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               {
                 count=(ssize_t) sscanf(text,"%ld,%ld: (%lf,%lf,%lf,%lf",
                   &x_offset,&y_offset,&pixel.red,&pixel.green,&pixel.blue,
@@ -675,7 +675,7 @@
       MagickColorspaceOptions,(ssize_t) image->colorspace),MaxTextExtent);
     LocaleLower(colorspace);
     image->depth=GetImageQuantumDepth(image,MagickTrue);
-    if (image->matte != MagickFalse)
+    if (image->alpha_trait == BlendPixelTrait)
       (void) ConcatenateMagickString(colorspace,"a",MaxTextExtent);
     (void) FormatLocaleString(buffer,MaxTextExtent,
       "# ImageMagick pixel enumeration: %.20g,%.20g,%.20g,%s\n",(double)
@@ -715,7 +715,7 @@
             ConcatenateColorComponent(&pixel,BlackPixelChannel,X11Compliance,
               tuple);
           }
-        if (pixel.matte != MagickFalse)
+        if (pixel.alpha_trait == BlendPixelTrait)
           {
             (void) ConcatenateMagickString(tuple,",",MaxTextExtent);
             ConcatenateColorComponent(&pixel,AlphaPixelChannel,X11Compliance,
diff --git a/coders/uil.c b/coders/uil.c
index cd1077d..6dd1945 100644
--- a/coders/uil.c
+++ b/coders/uil.c
@@ -230,7 +230,7 @@
         Convert DirectClass to PseudoClass image.
       */
       matte_image=(unsigned char *) NULL;
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         {
           /*
             Map all the transparent pixels.
diff --git a/coders/viff.c b/coders/viff.c
index 2f15101..11d8f7e 100644
--- a/coders/viff.c
+++ b/coders/viff.c
@@ -485,7 +485,7 @@
     /*
       Initialize image structure.
     */
-    image->matte=viff_info.number_data_bands == 4 ? MagickTrue : MagickFalse;
+    image->alpha_trait=viff_info.number_data_bands == 4 ? MagickTrue : MagickFalse;
     image->storage_class=
       (viff_info.number_data_bands < 3 ? PseudoClass : DirectClass);
     image->columns=viff_info.rows;
@@ -706,7 +706,7 @@
                   SetPixelBlue(image,image->colormap[(ssize_t)
                     GetPixelBlue(image,q)].blue,q);
                 }
-              SetPixelAlpha(image,image->matte != MagickFalse ?
+              SetPixelAlpha(image,image->alpha_trait == BlendPixelTrait ?
                 ScaleCharToQuantum(*(p+number_pixels*3)) : OpaqueAlpha,q);
               p++;
               q+=GetPixelChannels(image);
@@ -1010,7 +1010,7 @@
         /*
           Full color VIFF raster.
         */
-        viff_info.number_data_bands=image->matte ? 4UL : 3UL;
+        viff_info.number_data_bands=image->alpha_trait ? 4UL : 3UL;
         viff_info.color_space_model=VFF_CM_genericRGB;
         viff_info.data_storage_type=VFF_TYP_1_BYTE;
         packets=viff_info.number_data_bands*number_pixels;
@@ -1103,7 +1103,7 @@
             *q=ScaleQuantumToChar(GetPixelRed(image,p));
             *(q+number_pixels)=ScaleQuantumToChar(GetPixelGreen(image,p));
             *(q+number_pixels*2)=ScaleQuantumToChar(GetPixelBlue(image,p));
-            if (image->matte != MagickFalse)
+            if (image->alpha_trait == BlendPixelTrait)
               *(q+number_pixels*3)=ScaleQuantumToChar((Quantum)
                 (GetPixelAlpha(image,p)));
             p+=GetPixelChannels(image);
diff --git a/coders/webp.c b/coders/webp.c
index 49cfb23..e231600 100644
--- a/coders/webp.c
+++ b/coders/webp.c
@@ -163,7 +163,7 @@
     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
   image->columns=(size_t) width;
   image->rows=(size_t) height;
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   p=pixels;
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -376,7 +376,7 @@
       *q++=ScaleQuantumToChar(GetPixelRed(image,p));
       *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
       *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
-      if (image->matte != MagickFalse)
+      if (image->alpha_trait == BlendPixelTrait)
         *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
       p+=GetPixelChannels(image);
     }
@@ -385,7 +385,7 @@
     if (status == MagickFalse)
       break;
   }
-  if (image->matte == MagickFalse)
+  if (image->alpha_trait != BlendPixelTrait)
     webp_status=WebPPictureImportRGB(&picture,pixels,3*picture.width);
   else
     webp_status=WebPPictureImportRGBA(&picture,pixels,4*picture.width);
diff --git a/coders/wmf.c b/coders/wmf.c
index 77ca0bd..76314ba 100644
--- a/coders/wmf.c
+++ b/coders/wmf.c
@@ -2863,7 +2863,7 @@
   {
     image->background_color = image_info->background_color;
     if (image->background_color.alpha != OpaqueAlpha)
-      image->matte = MagickTrue;
+      image->alpha_trait = MagickTrue;
     (void) SetImageBackgroundColor(image,exception);
   }
   /*
diff --git a/coders/xc.c b/coders/xc.c
index 914b912..2267abc 100644
--- a/coders/xc.c
+++ b/coders/xc.c
@@ -137,7 +137,7 @@
         }
     }
   SetImageColorspace(image,pixel.colorspace,exception);
-  image->matte=pixel.matte;
+  image->alpha_trait=pixel.alpha_trait;
   for (y=0; y < (ssize_t) image->rows; y++)
   {
     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
diff --git a/coders/xcf.c b/coders/xcf.c
index cd82957..7dce50e 100644
--- a/coders/xcf.c
+++ b/coders/xcf.c
@@ -1063,7 +1063,7 @@
       if (image_type == GIMP_INDEXED)
         ThrowReaderException(CoderError,"ColormapTypeNotSupported");
   (void) SetImageBackgroundColor(image,exception);
-  image->matte=MagickTrue;
+  image->alpha_trait=BlendPixelTrait;
   /*
     Read properties.
   */
diff --git a/coders/xpm.c b/coders/xpm.c
index 940a419..dd21e10 100644
--- a/coders/xpm.c
+++ b/coders/xpm.c
@@ -376,7 +376,7 @@
     if (LocaleCompare(target,"none") == 0)
       {
         image->storage_class=DirectClass;
-        image->matte=MagickTrue;
+        image->alpha_trait=BlendPixelTrait;
       }
     status=QueryColorCompliance(target,AllCompliance,&image->colormap[j],
       exception);
@@ -657,7 +657,7 @@
   if (picon->storage_class == PseudoClass)
     {
       (void) CompressImageColormap(picon,exception);
-      if (picon->matte != MagickFalse)
+      if (picon->alpha_trait == BlendPixelTrait)
         transparent=MagickTrue;
     }
   else
@@ -665,7 +665,7 @@
       /*
         Convert DirectClass to PseudoClass picon.
       */
-      if (picon->matte != MagickFalse)
+      if (picon->alpha_trait == BlendPixelTrait)
         {
           /*
             Map all the transparent pixels.
@@ -881,7 +881,7 @@
   if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
     (void) TransformImageColorspace(image,sRGBColorspace,exception);
   opacity=(-1);
-  if (image->matte == MagickFalse)
+  if (image->alpha_trait != BlendPixelTrait)
     {
       if ((image->storage_class == DirectClass) || (image->colors > 256))
         (void) SetImageType(image,PaletteType,exception);
diff --git a/coders/ycbcr.c b/coders/ycbcr.c
index a983d0e..9056d9c 100644
--- a/coders/ycbcr.c
+++ b/coders/ycbcr.c
@@ -175,7 +175,7 @@
   if (LocaleCompare(image_info->magick,"YCbCrA") == 0)
     {
       quantum_type=RGBAQuantum;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
     }
   if (image_info->number_scenes != 0)
     while (image->scene < image_info->scene)
@@ -248,7 +248,7 @@
                 SetPixelRed(image,GetPixelRed(canvas_image,p),q);
                 SetPixelGreen(image,GetPixelGreen(canvas_image,p),q);
                 SetPixelBlue(image,GetPixelBlue(canvas_image,p),q);
-                if (image->matte != MagickFalse)
+                if (image->alpha_trait == BlendPixelTrait)
                   SetPixelAlpha(image,GetPixelAlpha(canvas_image,p),q);
                 p+=GetPixelChannels(canvas_image);
                 q+=GetPixelChannels(image);
@@ -288,7 +288,7 @@
           }
         for (y=0; y < (ssize_t) image->extract_info.height; y++)
         {
-          for (i=0; i < (image->matte != MagickFalse ? 4 : 3); i++)
+          for (i=0; i < (image->alpha_trait == BlendPixelTrait ? 4 : 3); i++)
           {
             if (count != (ssize_t) length)
               {
@@ -499,7 +499,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             for (y=0; y < (ssize_t) image->extract_info.height; y++)
             {
@@ -747,7 +747,7 @@
             if (status == MagickFalse)
               break;
           }
-        if (image->matte != MagickFalse)
+        if (image->alpha_trait == BlendPixelTrait)
           {
             (void) CloseBlob(image);
             AppendImageFormat("A",image->filename);
@@ -1006,7 +1006,7 @@
   if (LocaleCompare(image_info->magick,"YCbCrA") == 0)
     {
       quantum_type=RGBAQuantum;
-      image->matte=MagickTrue;
+      image->alpha_trait=BlendPixelTrait;
     }
   scene=0;
   do
@@ -1017,7 +1017,7 @@
     if (image->colorspace != YCbCrColorspace)
       (void) TransformImageColorspace(image,YCbCrColorspace,exception);
     if ((LocaleCompare(image_info->magick,"YCbCrA") == 0) &&
-        (image->matte == MagickFalse))
+        (image->alpha_trait != BlendPixelTrait))
       (void) SetImageAlphaChannel(image,OpaqueAlphaChannel,exception);
     quantum_info=AcquireQuantumInfo(image_info,image);
     if (quantum_info == (QuantumInfo *) NULL)