Seaplane on shore / thunderclouds / mountains

[Popanz (Uli)]

Blender AgX in darktable (proof of concept)

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 u…