Greg B

Unfortunately, Photoshop only supports HDR encoding at 32-bits (does seem rather odd that we've got 10-bit HDR display and need 32-bit source files to match - though the Lightroom HDR...

That's unfortunate. I might be able to help track down some of that info if its something you want to pursue, but sounds like a significant project. ImageMagick is able...

Thank you, I'll check that out. Due to the loss of color data (when using something better than sRGB), OpenEXR is probably a bit limiting. Even Photoshop seems to discard...

Krita is interesting. It will export a proper HDR PNG (when you select the appropriate settings). The output shows as a true HDR image in PS, but sadly does not...

FYI, the following image renders properly as HDR in Chrome, but opens as SDR (16-bit sRGB profile) when opened via avif-format in Photoshop. https://raw.githubusercontent.com/AOMediaCodec/av1-avif/master/testFiles/Netflix/avif/hdr_cosmos01000_cicp9-16-0_lossless.avif

Gotcha, thank you for confirming. I hadn't looked closely at how PS renders the PNG (https://github.com/AOMediaCodec/av1-avif/blob/master/testFiles/Netflix/avif/original_hdr_cosmos01000.png) vs how Chrome renders the AVIF derived from than PNG. I can't open both...

I'm not too familiar with CICP. Does that mean a unique enum / reference to save space wasted with embedding common color spaces ?

FYI, I was able to generate an HDR AVIF by converting a 32-bit TIF to a 16-bit HDR PNG and then using AVIFENC to convert that PNG to AVIF. **It...

Thank you for the explanation. I don't believe the CICP value is causing the issue I'm seeing with Chrome. The embedded profile in my PNG is very unusual. Unless AVIFENC...

> As for Firefox, its AVIF support is a work in progress, HDR is one of the features they do not yet support. Thank you for confirming. I was unclear...