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gjoseph92 / geogif

Turn xarray timestacks into GIFs
https://geogif.readthedocs.io/
MIT License
86 stars 4 forks source link

Optimize GIFs #17

Open gjoseph92 opened 1 year ago

gjoseph92 commented 1 year ago

The GIFs we create are really big. Like easily 10s of MBs.

I think that's because every frame is stored in full. You can compress GIFs by storing each frame as a delta, so only parts of the image that have changed are re-drawn.

See https://stackoverflow.com/q/42698983/17100540 (no answers). The last answer to this question https://stackoverflow.com/q/24688802/17100540 references a gifmaker.makedelta function, which doesn't seem to exist anymore, but maybe I found a version of in https://github.com/wnyc/PIL/blob/90b8b064178c9c0bd37d348ff2a45fd380e7149e/Scripts/gifmaker.py?

Could possibly be interesting to look at what gifsicle does: https://github.com/kohler/gifsicle/blob/master/src/optimize.c. I imagine something simpler would be possible to do pretty easily with NumPy/PIL.

gjoseph92 commented 1 month ago

Just came across https://github.com/ImageOptim/gifski, which might be an easier option to integrate with. Could probably build it into a wheel relatively easily with maturin.