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Re:Using Saliency in progressive JPEG XL images by zebracanevra on Friday September 10, 2021 @06:47AM (#28479770)
See https://github.com/libjxl/libjxl/pull/466 for more details.

As far as I understand it, the synthetic mode compresses better for (as you can guess) synthetic content. So if you're encoding a mixed content screenshot, you'll get better quality and size by encoding the photos and UI separately.

Re:Using Saliency in progressive JPEG XL images by est31 on Friday September 10, 2021 @06:58AM (#28479843)
Oh I see, that makes sense.