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Add PNG dWLm (Diffuse white luminance metadata ) chunk to conform to ISO 22028-5 #390

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digitaltvguy opened this issue Dec 10, 2023 · 2 comments · May be fixed by #391
Open

Add PNG dWLm (Diffuse white luminance metadata ) chunk to conform to ISO 22028-5 #390

digitaltvguy opened this issue Dec 10, 2023 · 2 comments · May be fixed by #391
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Future edition co...

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@digitaltvguy
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ISO 22028-5 High dynamic range and wide colour gamut encoding for still images (HDR/WCG) identifies a very important parameter (Diffuse white luminance metadata ).

This metadata allows us to determine at which point highlight compression might occur during HDR to SDR conversion.
@digitaltvguy digitaltvguy linked a pull request Dec 10, 2023 that will close this issue
added dWLm chunk #391
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@palemieux
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What is the relationship between diffuse white luminance metadata and reference white specified in Report ITU-R BT.2408?

@digitaltvguy
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Sounds like this will get added for 4th Edition.

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added dWLm chunk w3c/png
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@digitaltvguy @svgeesus @palemieux