commit b2e6b99c90e83a79b80b64f49450b99055faa7da
author cristy <urban-warrior@git.imagemagick.org> Sat Dec 17 16:42:29 2011 +0000
committer cristy <urban-warrior@git.imagemagick.org> Sat Dec 17 16:42:29 2011 +0000
tree 7c187c8a6996d134e3d9108982c6a0292cb0d832
parent 4cc99bd67611f9de0cf149a33519be389b0699f9

MagickCore/composite-private.h

diff --git a/MagickCore/composite-private.h b/MagickCore/composite-private.h
index bf8a909..d25f920 100644
--- a/MagickCore/composite-private.h
+++ b/MagickCore/composite-private.h
@@ -56,7 +56,7 @@
     i;
 
   /*
-    Compose pixel p over pixel q with the given opacities.
+    Compose pixel p over pixel q with the given alpha.
   */
   Sa=QuantumScale*alpha;
   Da=QuantumScale*beta,
@@ -102,7 +102,7 @@
       }
       case AlphaPixelChannel:
       {
-        composite[i]=ClampToQuantum(QuantumRange*gamma);
+        composite[i]=ClampToQuantum(QuantumRange*(Sa*(-Da)+Sa+Da));
         break;
       }
       default: