Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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magick compare -metric MSE $f1 $f2 NULL: 2>&1 >> /file
Output from compare goes to stderr not stdout. So you have to add 2>&1