Adding colour indicators to the primaries sliders (this has been requested): if I do this, how should the rotation sliders look?
The pre-curve controls are simpler, they could be like those in rgb primaries:
Those are quite fancy, BTW, as the purity sliders reflect the hue. For example:
However, the rotation reversal sliders are interesting.
There is reason to say they should look exactly like the rotation sliders, with the hue directions not flipped. Since these are reversal sliders, they would show what input hue you map to the selected primary. Internally, with the same pre- and post-curve settings, the two operations use the same matrix, only that the 2nd one is inverted: one undoes the effect of the other.
But I have the nagging feeling that people would want them the other way, e.g. if they shifted blue towards green, and got cyan they want to get rid of, they’d say “let’s shift blue towards red (magenta) this time” (and not “let’s shift cyan towards blue”). What do you think?
