gifsicle
Creating and editing GIF images and animations
Gifsicle manipulates GIF image files on the command line. It supports merging several GIFs into a GIF animation; exploding an animation into its component frames; changing individual frames in an animation; turning interlacing on and off; adding transparency; adding delays, disposals, and looping to animations; adding or removing comments; optimizing animations for space; and changing images' colormaps, among other things. The gifsicle package contains two other programs: gifview, a lightweight GIF viewer for X, can show animations as slideshows or in real time, and gifdiff compares two GIFs for identical visual appearance.
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