Do we have plans to support BT.2100 on avif about libavif HOT 3 CLOSED

Hi, would you mind expanding a bit on what you mean by supporting BT.2100?

Please forgive my ignorance but after looking up BT.2100 on wikipedia it seems that it's mostly about using either HLG or PQ as transfer characteristics, and BT.2020 for the primaries, all of which are already supported (there are defined in the CICP enums and can be signaled in the file).
BT.2100 also says that the bit depth should be 10 or 12 bits which libavif also supports.

In general, AVIF HDR images are already a thing. You can find examples on this page https://gregbenzphotography.com/hdr-gallery/ or here https://github.com/AOMediaCodec/av1-avif/tree/master/testFiles/Netflix/avif

We've also been working on a new type of HDR images that render better on all types of displays (SDR and HDR) using "gain maps", see Adobe's demo here https://helpx.adobe.com/camera-raw/using/gain-map.html This is also called "utlra HDR". It can be enabled in libavif by compiling with AVIF_ENABLE_EXPERIMENTAL_GAIN_MAP enabled but as the name suggests it's still experimental and in flux and should only be treated as a preview for now.

Let me know if I missed or misunderstood something.

from libavif.

Sorry, I know very little about libavif.
I didn't find BT.2100 in the avifColorPrimaries enumeration, so I don't think it's supported.Because BT.2100 and BT.2020 have the same color gamut, just different transfer characteristics. So You mean that BT.2100 images will be encoded with BT.2020 color gamut and HLG or PQ transfer. So BT.2100 is supported

from libavif.

Ok glad we agree it's already supported! Indeed you would just need to use colorPrimaries value 9 (bt.2020) and transferCharacteristics value 16 (PQ) or 18 (HLG).

from libavif.