The MagickWand interface is a new high-level C API interface to ImageMagick core methods. We discourage the use of the core methods and encourage the use of this API instead. Post MagickWand questions, bug reports, and suggestions to this forum.
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MagickSetImageOpacity() is a convenience method for setting the entire image to a fixed opacity intensity. You can then retrieve the opacity value for a particular pixel using a pixel wand or pixel iterator.