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by JyrkiAlakuijala
1157 days ago
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Claiming someone to 'spread misinformation' is not helpful. All the people related to compression that I know are trying their best to find the technically best solution by ethically best means. No dirty fighting observed. Check the site out: https://cloudinary.com/blog/time_for_next_gen_codecs_to_deth... "Meanwhile, it has been clarified that the AVIF limits listed above apply to the highest currently defined AVIF profile (the “Advanced” profile). It is also possible to use AVIF without a profile, and then the AV1 limits apply: a precision of up to 12-bit, and maximum dimensions of up to 65535x65535 (or more using grids). For HEIC, it is possible to use the container with a HEVC payload with a precision of up to 16-bit and with 4:4:4, although most hardware implementations do not support that." |
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No AVIF implementation supports all what the clarification there claims. Sometimes it has happened that the implementations led to the practical standardization, instead of what is written in the spec.
No one has yet seen the tile grid artefacts. One could expect that there will be barely visible stripes extending from one side of the image to the other, and from bottom to top. This would be because of 'loop filtering' and 'noise synthesis' states not shared between frames.
No one really knows how the coding performance is for 12-bit photographs. AV1 needs to double escape large values which can reduce entropy coding performance of large values. Lossless coding commonly codifies larger values than lossy (due to less quantization). One might be able to observe this in the performance of the lossless coding.
No one knows how much progressive AVIF will compress. The implementation doesn't exist yet. The progressive approach chosen is new, very different from JPEG1/JPEG XL approach. It will be interesting to learn about its performance.