Comments (4)
I played around a bit with that file, but I'm still not entirely sure where the differences are coming from. At least some of it is down to Chrome's tone mapping, because when I encode it in 8 bit 4:4:4, the highlights look a bit dimmer in Chrome than in WCG Image Viewer (with the SDR brightness slider at 31 = 204 nits, so Chrome should be a tiny bit brighter than reference). When I encode it as 10 or 12 bit 4:2:0, WCG Image Viewer silently fails to open it and just shows black. The Windows Photos app does at least open it, but the colors are very wrong, even at 8 bit 4:4:4... Not really sure what to make of all this, but without having a known-good application that can open jxr and avif files and actually display them accurately, it's hard to say if these differences are actually caused by the files or by the applications.
I should probably add some command line options for different output formats to make troubleshooting like this easier.
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Hm, that does look like a bug. Can you upload the .jxr file?
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I packed it because GitHub doesn't allow the JXR file type:
Screenshot 2023-11-03 22-22-21.zip
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HDR + WCG app reports the JXR to be 1250
nits. Chrome dims it for me.
My 649
nit JXRs get brightened by Chrome. I would take a guess that Chrome targets 1000 nits. I don't think it's an AVIF conversion problem.
I would look into: https://bugs.chromium.org/p/chromium/issues/detail?id=1339333
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Related Issues (4)
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