Commits on Oct 6, 2024

1. Color management nomenclature improvements …

   A round of color management improvements (I hope).
   
   We were pretty squirrelly about what "linear" meant. Get more exact.
   Now we will treat "linear" as a semi-obsolete synonym for "lin_rec709"
   (sRGB primaries, but linear response). Change file format readers to
   say "lin_rec709" when they mean it, and not use the more generic alias
   "linear".
   
   "scene_linear", on the other hand, is the internal working color space
   for math. Which concrete color space it is an alias for is determined
   by the OCIO config in use.
   
   Use "g18_rec709" and "g22_rec709" for rec709 + gamma 1.8 or 2.2,
   respectvely.
   
   A few new API calls help out: equivalent_colorspace(),
   set_colorspace(spec,name), set_colorspace_rec709_gamma().
   
   OpenEXR always tagged files as linear by default. It was too
   aggressive about this, so with this PR, now it defaults to lin_rec709
   only for files that appear to be RGB and not have any other clues
   about the color space.
   
   Similarly, the raw reader was too eager to set the Exif:ColorSpace to
   look like sRGB even when it wasn't.
   
   Lots of reference outputs needed to be updated.
   
   This is a potentially big behavior change. But I think it's for the
   better.
   
   Signed-off-by: Larry Gritz <lg@larrygritz.com>

   

   lgritz committed Oct 6, 2024
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