revisit gainmapmath constants

google / libultrahdr

Ultra HDR is a true HDR image format, and is backcompatible. libultrahdr is the reference codec for the Ultra HDR format. The codecs that support the format can render the HDR intent of the image on HDR displays; other codecs can still decode and display the SDR intent of the image.

https://developer.android.com/guide/topics/media/platform/hdr-image-format

Apache License 2.0

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revisit gainmapmath constants #227

Open ram-mohan opened 1 month ago

ram-mohan commented 1 month ago

luminance function for p3 gamut is using weights of DCI P3 instead of Display P3. This is corrected. Accordingly, the gamut conversions involving Display P3 are updated.
Increased precision of some constants used in csc, oetf and eotf functions.

Test: ./ultrahdr_unit_test

ram-mohan commented 1 month ago

Does this change affects the entries of ICC box