In this video of the darktable from A to Z series we take a look at rgb primaries. This module was introduced in darktable 3.6.0 and can be used to adjust the hue and purity of the RGB primary colors. This module is essentially a channel mixer but with a different interface.
Darktable user manual can be found at https://docs.darktable.org/usermanual/3.8/en/
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