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resize crop with imagemagick
# resize all files in directory <in> so that the shorter dimension (or both dims) is 64 pixels, then
# crop the longer dimension to 64 pixels.
magick convert in/* -resize 64x64^ -gravity center -extent 64x64 'out/%06d.jpg'
# crop images using find / exec. Find / exec is useful when there are many images and file globs don't work.
# Crop to 1150 by 512 at the top, left edge of the image
find ./*.jpg -exec magick convert {} -crop 1150x512+0+0 {} \;
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