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Showing content from https://github.com/mozilla/mozjpeg/issues/193 below:

Gamma-correct chroma subsampling · Issue #193 · mozilla/mozjpeg · GitHub

This image (source) should show RULES on an sRGB-ish monitor and/or browser with a good color management.

and if it's resized with appropriate gamma should resize to:

However, libjpeg blends pixels in Cr/Cb color space, which has non-linear gamma, and chroma subsampling results in:

It could be better. I've prototyped a very slow and hacky chroma downsampling that generates:

so there's definitely a room for improvement.


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