ImageMagick

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FAQ

Extract images from animated gif

convert img.gif -coalesce img/xx_%05d.png


Shrink image filesize

convert in.jpg -define jpeg:extent=512kb out.jpg

Convert to favicon

convert -define icon:auto-resize=256,64,48,32,16 foo.png favicon.ico


Check formats supported by your imagemagick

convert --version

or

magick -list format