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Add sharpyuv feature#190

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Galaxy4594 wants to merge 3 commits intogoogle:mainfrom
Galaxy4594:sharpyuv
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Add sharpyuv feature#190
Galaxy4594 wants to merge 3 commits intogoogle:mainfrom
Galaxy4594:sharpyuv

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@Galaxy4594
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@Galaxy4594 Galaxy4594 commented Mar 19, 2026

Ports over the sharpyuv feature from sjpeg and libwebp. It avoids the desaturation when using 420 subsampling, it's very noticeable on artwork with thin colored lines. It suffers quite a hit to performance at the moment. (~80 Mp/s to ~10 Mp/s). I have to disclose that is code is AI assisted.

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