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Add information about APNG support

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Andrew 2026-01-05 21:17:24 +13:00
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@ -78,6 +78,13 @@ are almost always better or equal to lower levels, this is not guaranteed and it
rare circumstances that a lower level may give a marginally smaller output. Similarly, using Zopfli rare circumstances that a lower level may give a marginally smaller output. Similarly, using Zopfli
compression (`-z`) is not guaranteed to always be better than without. compression (`-z`) is not guaranteed to always be better than without.
## APNG support
Oxipng currently only supports limited optimization of animated PNGs (APNGs). It can perform
alpha-optimization, refiltering and recompression of all frames, but all transformations will be
disabled. For best results, it is recommended to use another tool such as
[apngopt](https://sourceforge.net/projects/apng/files/APNG_Optimizer/) prior to running Oxipng.
## Git integration via [pre-commit] ## Git integration via [pre-commit]
Create a `.pre-commit-config.yaml` file like this, or add the lines after the `repos` map Create a `.pre-commit-config.yaml` file like this, or add the lines after the `repos` map