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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You must sync the pixel iterator after you update any pixels to ensure your updates are pushed to the pixel cache. See http://magick.imagemagick.org/script/architecture.php.