Steve Kinney <ad...@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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