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This is a meta-issue, tracking the various individual issues for 4th edition.
In general, discussion should happen on those issues, not here.
We will update this post to reflect the current status of 4th edition issues.
- gain maps
Proposal: gain maps for PNG #380
ISO 21496-1 is not yet free. Liaison established (see Liaison letter from ISO TC 42/WG 23 on Gain Maps #366 ). - gain curves
Some tone mapping requires the average luminance between frames #311
SMPTE ST 2094-50 is not yet free. However, we'll probably wait for AOM's version anyway. - T.35 metadata
T.35 is freely available. This is tied to gain curves, so it is also waiting. - Tone mapping general issues
Some tone mapping requires the average luminance between frames #311
Tone-mapping should be stable when mDCv and cLLi are static #319 - rWTm (reference white)
Add PNG dWLm (Diffuse white luminance metadata ) chunk to conform to ISO 22028-5 #390
ISO/TS 22028-5 is not freely available. Liaison work is being done here, too. - Negative cHRM values
- C2PA metadata
C2PA and PNG #542 - Cleanup
Filtering description confussion #543
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