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How to crop an image down to a square thumbnail
# takes image and fits to a square, cutting off edges
convert original.jpg -thumbnail 150x150^ -gravity Center -extent 150x150 new.jpg
# takes image and fits to a square, specified by bounds
convert -extract 200x200+250+0 -thumbnail 150x150^ -extent 150x150 -strip original.jpg new.jpg
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