One of the features I had been missing in darktable was the RGB curve. But thanks to the new R- G- B- channel blending modes available in V2.4+, I can now use multiple instances of base curve for different channels. My current problem is that the base curve does not have a color picker so that I cannot see which value I am changing. As far as I know, I cannot use the global color picker module either as it shows the final value of the pixel/area rather than the output of a specific iop (e.g. base curve). Is there any way to overcome this limitation?
P.S. I hope these three blending modes are added to the tone curve in future. I understand that the tone curve works in the Lab space but it might be possible just the way the “automatic in RGB” mode has been added to the “scale chroma” option of this iop.