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<h1>ImageMagick Version 7 Porting Guide</h1>
<p class="navigation-index">[<a href="porting.html#imv7">ImageMagick Version 7</a> &bull; <a href="porting.html#channels">Pixel Channels</a> &bull; <a href="porting.html#alpha">Alpha</a> &bull; <a href="porting.html#grayscale">Grayscale</a> &bull; <a href="porting.html#core">MagickCore API</a> &bull; <a href="porting.html#headers">Header Files</a> &bull; <a href="porting.html#depecate">Deprecated Features Removed</a> &bull; <a href="porting.html#cli">Command-line Interface</a> &bull; <a href="porting.html#summary">Version 7 Change Summary</a> ]</p>
<h2><a id="imv7"></a>ImageMagick Version 7</h2>
<div class="doc-section">
<p>The design of ImageMagick is an evolutionary process, with the design and implementation efforts serving to influence and guide further progress in the other. With ImageMagick version 7 we aim to improve the design based on lessons learned from the version 6 implementation. ImageMagick was originally designed to display RGB images to an X Windows server. Over time we extended support to RGBA images and then to the CMYK and CMYKA image format. With ImageMagick version 7, we extend support to arbitrary colorspaces with an arbitrary number of pixel channels. Other design changes are in the works and we will document them here so be sure to revisit periodically.</p>
<p>To support variable pixel channels in the MagickCore API, pixel handling has changed when getting or setting the pixel channels. You can access channels as an array, <em>pixel[i]</em>, or use an accessor such as GetPixelRed() or SetPixelRed(). There are some modest changes to the MagickWand API. Magick++ and PerlMagick should behave exactly as it does for ImageMagick version 6.</p>
<p>The shell API (command line) of ImageMagick version 7 is also undergoing
a major overhaul, with specific emphasis on the ability to read 'options' not
only from the command line, but also from scripts, and file streams. This
allows for the use of 'co-processing' programming techniques or performing
image handling using 'deamon/server backends', and even multi-machine
distributed processing.</p>
<p>With shell API overhaul other improvements are being made, including:
better reporting of which option failed, the consolidation and depreciation of
options, and more global use of 'image properities' (more commonly known as
'percent escapes' in option arguments. </p>
<p>We intend to make ImageMagick version 7 available as an Alpha release by the mid-year 2012. Look for a Beta release sometime in late 2012. An official ImageMagick version 7 release depends on how smoothly the Beta cycle progresses. During the Beta cycle, version 6 developers can attempt to port their software to version 7.<p>
<p>During the ImageMagick version 7 development cycle and release, we will continue to support and enhance version 6 for a minimum of 10 years.</p>
</div>
<h2><a id="channels"></a>Pixel Channels</h2>
<div class="doc-section">
<p>A pixel is comprised of one or more color values, or <em>channels</em> (e.g. red pixel channel).</p>
<p>Prior versions of ImageMagick (4-6), support 4 to 5 pixel channels (RGBA or CMYKA). The first 4 channels are accessed with the PixelPacket data structure. The structure includes 4 members of type Quantum (typically 16-bits) of red, green, blue, and opacity. The black channel or colormap indexes are supported by a separate method and structure, IndexPacket. As an example, here is a code snippet from ImageMagick version 6 that negates the color components (but not the alpha component) of the image pixels:</p>
<pre class="code">
for (y=0; y &lt; (ssize_t) image->rows; y++)
{
register IndexPacket
*indexes;
register PixelPacket
*q;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
{
status=MagickFalse;
continue;
}
indexes=GetCacheViewAuthenticIndexQueue(image_view);
for (x=0; x &lt; (ssize_t) image->columns; x++)
{
if ((channel & RedChannel) != 0)
q->red=(Quantum) QuantumRange-q->red;
if ((channel & GreenChannel) != 0)
q->green=(Quantum) QuantumRange-q->green;
if ((channel & BlueChannel) != 0)
q->blue=(Quantum) QuantumRange-q->blue;
if (((channel & IndexChannel) != 0) &&
(image->colorspace == CMYKColorspace))
indexes[x]=(IndexPacket) QuantumRange-indexes[x];
q++;
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
}
</pre>
<p>ImageMagick version 7 supports any number of channels from 1 to 32 (and beyond) and simplifies access with a single method that returns an array of pixel channels of type Quantum. Source code that compiles against prior versions of ImageMagick requires refactoring to work with ImageMagick version 7. We illustrate with an example. Let's naively refactor the version 6 code snippet from above so it works with the ImageMagick version 7 API:</p>
<pre class="code">
for (y=0; y &lt; (ssize_t) image->rows; y++)
{
register Quantum
*q;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
}
for (x=0; x &lt; (ssize_t) image->columns; x++)
{
if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
SetPixelRed(image,QuantumRange-GetPixelRed(image,q),q);
if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
SetPixelGreen(image,QuantumRange-GetPixelGreen(image,q),q);
if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
SetPixelBlue(image,QuantumRange-GetPixelBlue(image,q),q);
if ((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0)
SetPixelBlack(image,QuantumRange-GetPixelBlack(image,q),q);
if ((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0)
SetPixelAlpha(image,QuantumRange-GetPixelAlpha(image,q),q);
q+=GetPixelChannels(image);
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
}
</pre>
<p>Let's do that again but take full advantage of the new variable pixel channel support:</p>
<pre class="code">
for (y=0; y &lt; (ssize_t) image->rows; y++)
{
register Quantum
*q;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
}
for (x=0; x &lt; (ssize_t) image->columns; x++)
{
register ssize_t
i;
for (i=0; i &lt; (ssize_t) GetPixelChannels(image); i++)
{
PixelChannel
channel;
PixelTrait
traits;
channel=GetPixelChannelMapChannel(image,i);
traits=GetPixelChannelMapTraits(image,channel);
if (((traits &amp; UpdatePixelTrait) == 0) || (GetPixelMask(image,q) != 0))
continue
q[i]=QuantumRange-q[i];
}
q+=GetPixelChannels(image);
}
if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
status=MagickFalse;
}
</pre>
<p>Note, how we use GetPixelChannels() to advance to the next set of pixel channels.</p>
<p>The colormap indexes and black pixel channel (for the CMYK colorspace) are no longer stored in the index channel, previously accessed with GetAuthenticIndexQueue() and GetCacheViewAuthenticIndexQueue((). Instead they are now a pixel channel and accessed with the convenience pixel accessor methods GetPixelIndex(), SetPixelIndex(), GetPixelBlack(), and SetPixelBlack().</p>
<h4></a>Pixel Accessors</h4>
<p>Use accessors to get or set pixel channels:</p>
<pre class="text">
GetPixelAlpha()
GetPixelBlack()
GetPixelBlue()
GetPixelCb()
GetPixelChannels()
GetPixelCr()
GetPixelCyan()
GetPixelGray()
GetPixelGreen()
GetPixelIndex()
GetPixelInfoIntensity()
GetPixelInfoLuminance()
GetPixelMagenta()
GetPixelRed()
GetPixelPacket()
GetPixelPacketIntensity()
GetPixelY()
GetPixelYellow()
GetPixelIntensity()
SetPixelAlpha()
SetPixelBlack()
SetPixelBlue()
SetPixelCb()
SetPixelChannels()
SetPixelCr()
SetPixelCyan()
SetPixelGray()
SetPixelGreen()
SetPixelIndex()
SetPixelInfo()
SetPixelInfoBias()
SetPixelInfoPacket()
SetPixelMagenta()
SetPixelRed()
SetPixelPacket()
SetPixelPixelInfo()
SetPixelYellow()
SetPixelY()
</pre>
<p>You can find these accessors defined in the header file, <kbd>MagickCore/pixel-accessor.h</kbd></p>
<h4></a>Pixel Traits</h4>
<p>Each pixel channel includes one or more of these traits:</p>
<dl>
<dt>Undefined</dt>
<dd>no traits associated with this pixel channel<dd>
<dt>Copy</dt>
<dd>do not update this pixel channel, just copy it<dd>
<dt>Update</dt>
<dd>update this pixel channel<dd>
<dt>Blend</dt>
<dd>blend this pixel channel with the alpha mask if it's enabled<dd>
</dl>
<p>We provide these methods to set and get pixel traits:</p>
<pre class="text">
GetPixelAlphaTraits()
GetPixelBlackTraits()
GetPixelBlueTraits()
GetPixelCbTraits()
GetPixelCrTraits()
GetPixelCyanTraits()
GetPixelGrayTraits()
GetPixelGreenTraits()
GetPixelIndexTraits()
GetPixelMagentaTraits()
GetPixelRedTraits()
GetPixelChannelTraits()
GetPixelYTraits()
GetPixelYellowTraits()
SetPixelAlphaTraits()
SetPixelBlackTraits()
SetPixelBlueTraits()
SetPixelCbTraits()
SetPixelChannelTraits()
SetPixelCrTraits()
SetPixelGrayTraits()
SetPixelGreenTraits()
SetPixelIndexTraits()
SetPixelMagentaTraits()
SetPixelRedTraits()
SetPixelYellowTraits()
SetPixelYTraits()
</pre>
<p>For convenience you can set the active trait for a set of pixel channels with a channel mask and these methods:</p>
<pre class="text">
PopPixelChannelMap()
SetPixelChannelMap()
SetPixelChannelMask()
</pre>
<p>Previously MagickCore methods had channel analogs, for example, NegateImage() and NegateImageChannels(). The channel analog methods are no longer necessary because the pixel channel traits specify whether to act on a particular pixel channel and whether to blend with the alpha mask. For example, instead of</p>
<pre class="text">
NegateImageChannel(image,channel);
</pre>
<p>we use:</p>
<pre class="text">
channel_mask=SetPixelChannelMask(image,channel);
NegateImage(image,exception);
(void) SetPixelChannelMap(image,channel_mask);
</pre>
<h4></a>Pixel User Channels</h4>
<p>In version 7, we introduce pixel user channels. Traditionally we utilize 4 channels, red, green, blue, and alpha. For CMYK we also have a black channel. User channels are designed to contain whatever additional channel information that makes sense for your application. Some examples include extra channels in TIFF or PSD images or perhaps you require a channel with infrared information for the pixel. You can associate traits with the user channels so that they when they are acted upon by an image processing algorithm (e.g. blur) the pixels are copied, acted upon by the algorithm, or even blended with the alpha channel if that makes sense.</p>
<h4></a>Pixel Metacontent</h4>
<p>In version 7, we introduce pixel metacontent. Metacontent is content about content. So rather than being the content itself, it's something that describes or is associated with the content. Here the content is a pixel. The pixel metacontent is for your exclusive use and is accessed with these MagickCore API methods:</p>
<pre class="text">
SetImageMetacontentExtent()
GetImageMetacontentExtent()
GetVirtualMetacontent()
GetAuthenticMetacontent()
GetCacheViewAuthenticMetacontent()
GetCacheViewVirtualMetacontent()
</pre>
</div>
<h2><a id="alpha"></a>Alpha</h2>
<div class="doc-section">
<p>We support alpha now, previously opacity. With alpha, a value of 0 means that the pixel does not have any coverage information and is transparent; i.e. there was no color contribution from any geometry because the geometry did not overlap this pixel. A value of QuantumRange means that the pixel is opaque because the geometry completely overlapped the pixel. As a consequence, in version 7, the PixelInfo structure member alpha has replaced the previous opacity member.</p>
</div>
<h2><a id="grayscale"></a>Grayscale</h2>
<div class="doc-section">
<p>Previously, grayscale images consumed 4 channels: red, green, blue, and alpha. With version 7, grayscale consumes only 1 channel consuming far less resources as a result. However, there may be unintended consequences. With 1 channel, all image processing algorithms write to this one channel. Drawing yellow text on a grayscale image will produce gray lettering. To get the expected results, simply modify the colorspace to RGB (e.g. -colorspace rgb).</p>
</div>
<h2><a id="core"></a>MagickCore API</h2>
<div class="doc-section">
<p>Almost all image processing algorithms are now channel aware.</p>
<p>MagickCore, version 7, adds an ExceptionInfo argument to those methods that lacked it in version 6, e.g. NegateImage(image,MagickTrue,exception);</p>
<p>All method channel analogs have been removed (e.g. BlurImageChannel()), they are no longer necessary, use pixel traits instead.</p>
<p>Public and private API calls are now declared with the GCC visibility attribute. The MagickCore and MagickWand dynamic libraries now only export public struct and function declarations.</p>
<p>The InterpolatePixelMethod enum is now PixelInterpolateMethod.</p>
<p>The IntegerPixel storage type is removed (use LongPixel instead) and LongLongPixel is added</p>
<p>Image signatures have changed to account for variable pixel channels.</p>
<p>All color packet structures, PixelPacket, LongPacket, and DoublePacket, are consolidated to a single color structure, PixelInfo.</p>
</div>
<h2><a id="headers"></a>Header Files</h2>
<div class="doc-section">
<p>Prior versions of ImageMagick (4-6) reference the ImageMagick header files as <kbd>magick/</kbd> and <kbd>wand/</kbd>. ImageMagick 7 instead uses <kbd>MagickCore/</kbd> and <kbd>MagickWand/</kbd> respectively. For example,</p>
<pre class="code">
#include &lt;MagickCore/MagickCore.h>
#include &lt;MagickWand/MagickWand.h>
</pre>
</div>
<h2><a id="deprecate"></a>Deprecated Features Removed</h2>
<div class="doc-section">
<p>All deprecated features from ImageMagick version 6 are removed in version 7. These include the <kbd>Magick-config</kbd> and <kbd>Wand-config</kbd> configuration utilities. Instead use:</p>
<pre class="code">
MagickCore-config
MagickWand-config
</pre>
<p>The FilterImage() method has been removed. Use ConvolveImage() instead.</p>
<p>In addition, all deprecated <a href="http://magick.imagemagick.org/api/deprecate.html">MagickCore</a> and <a href="http://magick.imagemagick.org/api/magick-deprecate.html">MagickWand</a> methods are no longer available in version 7.</p>
</div>
<h2><a id="cli"></a>Shell API or Command-line Interface</h2>
<div class="doc-section">
<p>As mentioned the primary focus of the changes to the Shell API or Command
Line Interface is the the abstration so that not only can 'options' be read
from command line arguments, but also from a file (script) or from a file
stream (interactive commands, or co-processing). </p>
<p>To do this the CLI parser needed to be re-written, so as to always perform
all options, in a strict, do-it-as-you-see it order. Previously in IMv6
options were performed in groups (known as 'FireOptions), this awkwardness is
now gone. However the strict order means that you can no long give operations
before providing an image for the operations to work on. To do so will now
produce an error. </p>
<p>Error reporting is now reporting exactly which option (by argument count on
command line, or line,column in scripts) caused the 'exception'. This is not
complete as yet but getting better. Also not complete is 'regard-warnings'
handling or its replacement, which will allow you to ignore reported errors
and continue processing (as appropriate due to error) in co-processes or
interactive usage. </p>
<p>The parenthesis options used to 'push' the current image list, and image
settings (EG: '<kbd>(</kbd>' and '<kbd>)</kbd>' ) on to a stack now has
a completely seperate image settings stack. That is parenthesis 'push/pull'
image lists, and curly braces (EG: '<kbd>{</kbd>' and '<kbd>}</kbd>' ) will
'push/pull' image settings. </p>
<p>Of course due to the previously reported changes to the underlying channel
handling will result be many side effects to almost all options. Here are some
specific </p>
<p>Most algorithms update the red, green, blue, black (for CMYK), and alpha
channels. Most operators will blend alpha the other color channels, but other
operators (and situations) may require this blending to be disabled, and is
currently done by removing alpha from teh active channels via
<kbd>-channel</kbd> option. (e.g. <kbd>convert castle.gif -channel RGB
-negate castle.png</kbd>). </p>
<p>Reading gray-scale images will generate a image with only one channel. If
that image is to then accept color the <kbd>-colorspace</kbd> setting needs to
be applied to expand the one channel into separate RGB (or other) channels.
</p>
<h3>Command Changes</h3>
<dl>
<dt>magick</dt>
<dd>The "<kbd>magick</kbd>" command is the new primary command of the Shell
API, replacing the old "<kbd>convert</kbd>" command. This allows you to
create a 'magick script' of the form "<kbd>#!/path/to/command/magick
-script</kbd>", or pipe options into a command "<kbd>magick -script
-</kbd>, as abackground process. </dd>
<dt>magick-script</dt>
<dd>This the same as "<kbd>magick</kbd>", (only command name is different)
but which has an implict "<kbd>-script</kbd>" option. This allows you to
use it in an "<kbd>env</kbd>" style script form. That is a magick script
starts with the 'she-bang' line of "<kbd>#!/usr/bin/env
magick-script</kbd>" allowing the script interpreter to be found anywhere
on the users command "<kbd>PATH</kbd>". This is required to get around
a "one argument she-bang bug" that is common on most UNIX systems
(including Linux, but not MacOSX).</dd>
</dl>
<h3>New Options</h3>
<p>ImageMagick version 7 supports these new options, though most are limited
to the "<kbd>magick</kbd>" command, or to use in "<kbd>magick</kbd>"
scripts.</p>
<dl>
<dt>{ ... }</dt>
<dd>Save (and restore) the current image settings (internally known as the
"image_info" structure). This is automatically done with parenthesis (EG:
'<kbd>(</kbd>' and '<kbd>)</kbd>') is "<kbd>-regard-parenthesis</kbd>" has
been set, just as in IMv6. Caution is advised to prevent un-balanced
braces errors.</dd> </dd>
<dt>--</dt>
<dd>End of options, to be used in IMv7 "<kbd>mogrify</kbd>" command to
explictally separate the operations to be applied and the images that
are to be processed 'in-place'. (not yet implemented). However if
not provided, "<kbd>-read</kbd>" can still be used to differentiate
secondary image reads (for use in things like alpha composition) from
the 'in-place' image being processed. </dd>
<dd>In other commands (such as "magick") it is equivelent to a explict
"<kbd>-read</kbd>" (see below) of the next option as a image (as it was in
IMv6). </dd>
<dt>-channel-fx <em class="arg">expression</em> </dt>
<dd>
<p>exchange, extract, or copy one or more image channels.</p>
<p>The expression consists of one or more channels, either mnemonic or numeric (e.g. red, 1), separated by certain operation symbols as follows:</p>
<pre class="text">
&lt;=&gt; exchange two channels (e.g. red&lt;=&gt;blue)
=&gt; copy one channel to another channel (e.g. red=&gt;green)
= assign a constant value to a channel (e.g. red=50%)
, write new image with channels in the specified order (e.g. red, green)
; add a new output image for the next set of channel operations
| move to the next input image for the source of channel data
</pre>
<p>For example, to create 3 grayscale images from the red, green, and blue channels of an image, use:</p>
<pre class="text">
-channel-fx "red; green; blue"
</pre>
<p>A channel without an operation symbol implies separate (i.e, semicolon).</p>
</dd>
<dt>-exit</dt>
<dd>Stop processing at this point. No further options will be processed after
this option. Can be used in a script to force the "<kbd>magick</kbd>"
command to exit, without actually closing the pipeline that it is
processing options from. </dd>
<dd>May also be used as a 'final' option on the "<kbd>magick</kbd>" command
line, instead of a implicit output image, to completely prevent any image
write. ASIDE: even the "<kbd>NULL:</kbd>" coder requires at least one
image, for it to 'not write'! This option does not require any images at
all. </dd>
<dt>-read {image}</dt>
<dd>Explicit read of an image, rather than an implicit read. This allows you
to read from filenames that start with an 'option' character, and which
otherwise could be mistaken as an option (unknown or otherwise). This will
eventually be used in "<kbd>mogrify</kbd>" to allow the reading of
secondary images, and allow the use of image list operations within that
command. </dd>
<dt>-region</dt>
<dd>not yet implemented in "<kbd>magick</kbd>". (very soon)</dd>
<dt>-script {file}</dt>
<dd>In "<kbd>magick</kbd>", stop the processing of command line arguments as
image operations, and read all further options from the given file or
pipeline.</dd>
</dl>
<h3>Changed Options</h3>
<p>These options are known to have changed, in some way.</p>
<dl>
<dt>-negate</dt>
<dd>currently negates all channels, including alpha if present. As such you
may need to use the -channel option to prevent alpha negation. </dd>
<dt>-convolve</dt>
<dd>option no longer normalizes the kernel argument (unless some type of
masking is involved, such as alpha blending) and accepts named kernels
(see <a href="http://www.imagemagick.org/Usage/convolve/" >IM Examples,
Convolve</a> ) as well as non-square <a
href="http://www.imagemagick.org/Usage/morphology/#user">user defined
kernels</a>. Use <kbd>-define convolve:normalize=true</kbd> on the command-line to force normalization.</dd>
</dl>
<h3>Depreciated warning given, but will work (for now)</h3>
<dl>
<dt>-affine</dt>
<dd>Replaced by <kbd>-draw "affine ..."</kbd>. (see transform)</dd>
<dt>-average</dt>
<dd>Replaced by <kbd>-evaluate-sequence Mean</kbd>.</dd>
<dt>-box</dt>
<dd>Replaced by <kbd>-undercolor</kbd>.</dd>
<dt>-deconstruct</dt>
<dd>Replaced by <kbd>-layers CompareAny</kbd>.</dd>
<dt>-gaussian</dt>
<dd>Replaced by <kbd>-gaussian-blur</kbd>.</dd>
<dt>-/+map</dt>
<dd>Replaced by <kbd>-/+remap</kbd>.</dd>
<dt>-/+matte</dt>
<dd>Replaced by <kbd>-alpha Set/Off</kbd>.</dd>
<dt>-transform</dt>
<dd>Replaced by <kbd>-distort Affine "..."</kbd>.</dd>
</dl>
<h3>Depreciated warning given, and ignored (for now)</h3>
<p>Almost 'plus' (+) option that did not do anything has been marked as
depreciated, and does nothing. It does not even have associated code. For
example "+annotate", "+resize", "+clut", and "+draw" .</p>
<dl>
<dt>-affinity</dt>
<dd>Replaced by <dd>-affinity</kbd>.</dd>
<dt>-maximum</dt>
<dd>Replaced by <kbd>-evaluate-sequence Max</kbd>.</dd>
<dt>-median</dt>
<dd>Replaced by <kbd>-evaluate-sequence Median</kbd>.</dd>
<dt>-minimum</dt>
<dd>Replaced by <kbd>-evaluate-sequence Min</kbd>.</dd>
<dt>-recolor</dt>
<dd>Replaced by <dd>-color-matrix</kbd>.</dd>
</dl>
<h3>Removed / Replaced Options ("no such option" error and abort)</h3>
<dl>
<dt>-origin</dt>
<dd>old option, unknown meaning.</dd>
<dt>-pen</dt>
<dd>Replaced by <dd>-fill</kbd>.</dd>
<dt>-passphrase</dt>
<dd>old option, unknown meaning</dd>
</dl>
</div>
<h2><a id="summary"></a>Version 7 Change Summary</h2>
<div class="doc-section">
<p>Changes from ImageMagick version 6 to version 7 are summarized here:</p>
<h5>Pixels</h5>
<dl>
<li>Pixels are no longer addressed with PixelPacket structure members (e.g. red, green, blue, opacity) but as an array of channels (e.g. pixel[PixelRedChannel]).</li>
<li>Use convenience macros to access pixel channels (e.g. GetPixelRed(), SetPixelRed()).</li>
<li>The black channel for the CMYK colorspace is no longer stored in the index channel, previously accessed with GetAuthenticIndexQueue() and GetCacheViewAuthenticIndexQueue((). Instead it is now a pixel channel and accessed with the convenience pixel macros GetPixelBlack() and SetPixelBlack().</li>
<li>The index channel for colormapped images is no longer stored in the index channel, previously accessed with GetAuthenticIndexQueue() and GetCacheViewAuthenticIndexQueue((). Instead it is now a pixel channel and accessed with the convenience pixel macros GetPixelIndex() and SetPixelIndex().</li>
<li>Use GetPixelChannels() to advance to the next set of pixel channels.</li>
<li>Use the <em>metacontent</em> channel to associate metacontent with each pixel.</li>
<li>All color packet structures, PixelPacket, LongPacket, and DoublePacket, are consolidated to a single color structure, PixelInfo.</li>
</dl>
<h5>Alpha</h5>
<dl>
<li>We support alpha rather than opacity (0 transparent; QuantumRange opaque).</li>
<li>Use GetPixelAlpha() or SetPixelAlpha() to get or set the alpha pixel channel value.</li>
</dl>
<h5>Grayscale</h5>
<dl>
<li>Grayscale images consume one pixel channel in ImageMagick version 7. To process RGB, set the colorspace to RGB (e.g. -colorspace rgb).</li>
</dl>
<h5>MagickCore API</h5>
<dl>
<li>Almost all image processing algorithms are now channel aware.</li>
<li>MagickCore, version 7, adds an ExceptionInfo argument to those methods that lacked it in version 6, e.g. NegateImage(image,MagickTrue,exception);</li>
<li>All method channel analogs have been removed (e.g. BlurImageChannel()), they are no longer necessary, use pixel traits instead.</li>
<li>Public and private API calls are now declared with the GCC visibility attribute. The MagickCore and MagickWand dynamic libraries now only export public struct and function declarations.</li>
<li>The InterpolatePixelMethod enum is now PixelInterpolateMethod.</li>
<li>To account for variable pixel channels, images may now return a different signature.</li>
</dl>
<h5>Deprecated Methods</h5>
<dl>
<li>All ImageMagick version 6 MagickCore and MagickWand deprecated methods are removed and no longer available in ImageMagick version 7.</li>
<li>All MagickCore channel method analogs are removed (e.g. NegateImageChannels()). For version 7, use pixel traits instead.</li>
<li>The FilterImage() method has been removed. Use ConvolveImage() instead.</li>
</dl>
</div>
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