An update on HDR and color management in KWin

Re:An update on HDR and color management in KWin by amluto on Wednesday December 20, 2023 @03:27PM (#38713176)

Something is utterly busted about the spec and the patent system. Look at the Swift code for decoding the headroom! It stinks — maybe Apple tried a few different transfer functions or for size and didn’t bother to mark which version was in use? And now Apple is kindly offering to license the patent if this goes into an ISO standard?

I’m sorry, but a system to decide old nonsensical formats should not require a license.

Also… the gain map is subsampled 1:2. Surely this will cause annoying artifacts at sharp edges where one side is much brighter.

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Re:An update on HDR and color management in KWin by kllrnohj on Wednesday December 20, 2023 @05:57PM (#38714766)

> And now Apple is kindly offering to license the patent if this goes into an ISO standard?

The one that's likely to go to an ISO standard is the Adobe spec here: https://helpx.adobe.com/camera-raw/using/gain-map.html (which is the same as Google's "UltraHDR")

And that has a blanket public grant for usage.

> Also… the gain map is subsampled 1:2.

Subsampling is optional, you can do 1:1 if you want.

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