I was working on a shot of a purple flower on green background, and wanted to darken and desaturate the background.
Using color calibration, I dragged the green down on the colorfulness tab:
It appears to me that the flower was affected way more than the background.
I then tried a colour wheel:
Less red colourfulness:
The brightness tab works as I’d expect:
@aurelienpierre: is this the expected behaviour?