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WebP lossless is also RGB lossless. I designed it and this was one of the main functional requirements I chose for it. Particularly, WebP lossless does not use
by JyrkiAlakuijala 4y ago
WebP lossless is also RGB lossless. I designed it and this was one of the main functional requirements I chose for it.
Particularly, WebP lossless does not use YUV compression. It does (optionally) reduce component correlations by the 'subtract green' transform.
It might be possible to construct an ICC profile in that formalism that would go close to YUV, but that is definitely not supported currently in cwebp.