Blender AgX in darktable (proof of concept)

Software darktable
1544

So, a new build:

  • gamut (negative) controls using the algorithm from Blender’s AgX;
    • they are applied in the ‘base’ space, just like in Blender
  • the ‘tuned’ primaries are available as presets blender-like|tuned and blender-like|tuned punchy. Please test them; if there are no objections, I’d like to make them the default, as they seem to match Blender AgX results more closely (see above)
  • the default for preserve hue is now 40% for all blender-like presets, as that is what the generator script uses.

The build includes all changes from master up to and including 7771198f (a.k.a g7771198f).

Linux AppImage: https://tech.kovacs-telekes.org/dt-agx/Darktable-5.1.0%2B1150~g524104c8d7-x86_64.AppImage

@Dave22152 , @MStraeten , @priort , please update your builds.

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