HDR10+, Creative Intent and Display Adaptation
"HRD10 and HDR10+ are open standards, so lack the relative guarantee of image playback, with each display manufacturer defining their own internal HDR processing." [Light Illusion]
https://www.lightillusion.com/hdr_calibration.html
"HDR10+ does not specify how the metadata gets utilized by the target display." [Penton]
https://forum.blu-ray.com/showthread.php?p=15665093#post15665093
"The open-source nature of HDR10+ means that manufacturers are free to develop the technology themselves, bringing their own expertise to the implementation of dynamic metadata." [Steve Withers]
https://www.avforums.com/article/what-is-hdr10-plus-dynamic-metadata.13884
"HDR10+ does not specify implementations." [HDR10+ Technologies, LLC]
http://mile-high.video/files/mhv2018/pdf/day1/1_10_Mandel.pdf
Due to the lack of HDR10+ display adaptation standardization across manufacturers, a film can look quite different on HDR10+ TV from different manufacturers.
Hopefully in order to fix this very loose interpretation of the original creative intent, a reference implementation of HDR10+ display adaptation (i.e. HDR10+ Color Volume Mapping) will emerge and will be universally adopted. And this HDR10+ reference implementation will allow creative artists to preview and adjust HDR10+ at the mastering post-production time.
"In the making of commercial images the only thing that matters is what happens at the approval process. Everything that happens downstream of this should not alter this image. In other words, the "artistry" happens in mastering process and once approved, should be faithfully delivered to the end user." [Charles Poynton]
http://www.insightmedia.info/a-day-with-charles-poynton/
https://blog.pond5.com/7776-lighting-for-a-mood-making-the-most-of-key-color-and-contrast/
https://digitalsynopsis.com/design/film-movies-color-psychology/
The HDR mastering reference monitor (or more precisely the HDR media color volume) and the end user’s HDR TV usually don’t have the same color volume, hence the need for color volume mapping or display adaptation.
And more, there is a diversity of HDR TVs, i.e. a diversity of reduced color volumes to be adapted from a larger mastering color volume while respecting artistic creative intent approved at the mastering post-production time.
"If some viewing conditions change in one case, two identical stimuli with thereby identical XYZ tristimulus values will create different color appearances (and vice versa: two different stimuli with thereby different XYZ tristimulus values might create an identical color appearance)."
https://www.google.fr/search?q="col.....69i57j0l5.6959j0j9&sourceid=chrome&ie=UTF-8
The very same RGB value looks quite different on TVs with different luminance capabilities.
https://developer.apple.com/videos/play/tech-talks/502/
If the artistic intent is a given vivid red, the dynamic metadata associated to this vivid red image sent to the Color Volume Remapping of low luminance TV should convey parameters (i.e. supplementary color grading information) to adjust / increase the saturation of the color red to a given level.
This color saturation increase should be determined by the creative artists adjusting and making decisions on the appearance of the content based on the look of a reference TV (i.e. end-user TV having a reference HDR10+ Color Volume Remapping / reference HDR10+ display adaptation) at the mastering post-production time.
https://www.broadcastingcable.com/p...-4k-plus-and-corvid-4k-developer-cards-168701
