Optimize animated GIF size in command-line

Use gifsicle (available for Mac OS X, Windows, DOS, Debian, FreeBSD and NetBSD).

gifsicle -i anim.gif -O3 --colors 256 -o anim-opt.gif

This will optimize and reduce to 256 colors, if the animation uses more colors (the example image does).

You can reduce the size by reducing the number of colors:

example image with only 256 colors 512KB, 256 colors

example image with only 128 colors 412KB, 128 colors

example image with only 64 colors 340KB, 64 colors

example image with only 32 colors 240KB, 32 colors

example image with only 16 colors 140KB, 16 colors

Based on another Q&A.

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