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Gifsicle change canvas size4/7/2023 As for size, it was almost right in between the sizes produced by ImageMagic and ffmpeg.īut the additional conversion process put this one out of the running for me. I didn’t time it, but I feel like it was more than a minute for 300 frames. OK, I was able to put together a quick ImageMagick script to convert all my pngs to gifs. Big drawback on this workflow though: the source images have to be gifs themselves. I think it would be better to do this in the palette creating stage.īut gifsicle can also create gifs from a sequence of images, just like ImageMagick and ffmpeg. This got considerable results, but at a loss of quality. You can also use gifsicle to reduce colors in an existing gif. The highest level took a single megabyte off of a 27 mb gif. You can specify three levels of optimization. I tried it on some of the larger ffmpeg-created gifs and it didn’t seem to do a whole lot. I first heard about gifsicle a while ago as a tool to optimize gifs. Unfortunately, there's not a lot you can do about that, except to choose a more suitable background or to re-render the animation.I’ve been continuing my search on the ultimate gif-making workflow and came across two more tools.īoth of these are command line tools available across platforms. This is OK as long as the background you're showing the animation on isn't too far from the original background color, but if it is, you may find that there will be some ugly color fringing around the edges of the animation. You can't actually tell the difference by eye (or, at least, I can't do that on this screen), but it's enough to make GIFsicle consider the two colors different.Īlso note that GIF files only support 1-bit transparency, which means that the edges of the transparent regions will not be anti-aliased. very slightly yellow-greenish white) rather than #ffffff (pure white). For example, for the animation shown above, the actual background color turned out to be #fdfffc (i.e. One detail worth noting is that, if the GIFsicle command doesn't seem to have any effect, you should check that the background color is really correct. Original animation by Wikimedia Commons user WillowW, used under the CC-By 3.0 license. The -O2 option is not strictly necessary, but it's likely to shrink the file size of the resulting animation by optimizing the frames to avoid needlessly re-drawing static parts of the animation.)įor a demostration, here's an animation of the human glyoxalase I (GLO1) enzyme from Wikimedia Commons (left), and the same animation with transparency added using the method shown above (right): This allows extra transparency to be added to the frames without letting the earlier frames show through the transparent parts. (The important options here are -U / -unoptimize and -disposal=previous, which together convert the animation into "flipbook mode", where each frame is fully erased before drawing the next one. Where anim.gif and anim_trans.gif are the source and destination file names, and #ffffff is the hex code of the color you want to make transparent (here, pure white). You can do this with GIFsicle, using the following options: gifsicle -U -disposal=previous -transparent=" #ffffff" -O2 anim.gif > anim_trans.gif
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