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How can I transform an image while maintaining its original size by cutting off some areas, and filling others (preferably with a specifiable background color), using Imagemagick on the windows command line:
Here is the basic idea.
Note: Please be sure the method is lossless if possible (besides the limitations of reading and writing from lossy formats).
Okay, after going through the Imagick documentation several times, I figured it out.
the page option is what I needed:
magick [input image] -page +20+20 -background black -flatten [output image]
the background can also be made transparent using the alpha option.