Steve Kinney <admin pilobilus net> writes:
To radically reduce the file size of an animated GIF, use the command Filters > Animation > Optimize (for GIF). This will create a new image, with everything that does NOT change from one frame to the next, deleted from the next frame, from the bottom of the layer stack (first frame) to the top (last frame).
But always try exporting both with and without "Optimize (for GIF)". When I try optimising, it typically makes the GIF file about 2 % larger rather than smaller (example: http://filebin.net/oagzulb65w). I've also tried ImageMagick's "convert -layers Optimize" on GIMP-exported gifs. This either makes the file larger (regardless of if I've used "Optimize (for GIF)" in GIMP first), or crashes with convert: malloc.c:2369: sysmalloc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed. Aborted (core dumped) What does have a major effect, however, is doing Image→Mode→Indexed and selecting some low number of colours. (This is where "Save for Web" is handy, since it lets you type in numbers and press TAB and get a quick preview of indexing. "Save for Web" doesn't save animations though, so it's _only_ useful for that preview.) -- Kevin Brubeck Unhammer GPG: 0x766AC60C
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