Gifsicle

Apply Steinberg Flyod Dithering in Gifsicle

gifsicle -O3 --colors 4 --dither input.gif -o output.gif

Convert to Black and White

gifsicle --colors 256 --use-col=gray input.gif -o output.gif

Drop every second Frame

This doubles the speed and cuts the file size by 50%.

todo

Hard Conversion to Black and White

gifsicle --use-colormap bw flip2.gif -o output.gif

Reduce Colors and apply Dithering

gifsicle --colors=64 --dither input.gif -o output.gif

Change Speed

gifsicle --delay=TIME INPUT_GIF -o OUTPUT_GIF

Generate an animated Gif from single Gif frames

gifsicle --delay=10 --loop out/*.gif > output.gif

With dithering and color setting:

gifsicle --delay=2 --colors 3 --dither --loop out/*.gif > output.gif