I normally linear fit the R,G,B channels to the lowest median value channel of those channels (as shown in statistics). By linear fitting like this I find colour calibration is normally not necessary, even though I still carry it out.

Luminance is normally much higher R,G,B. Should the luminance be similarly linear fitted to the RGB channels as well? Or would one be "wasting" much of the integration time if doing that? I have started to do a linear fit of the luminance but I am not 100% sure about this and whether it is valid.

I normally do NOT linear fit the Ha to the LRGB channels. I'd only even linear fit the Ha to the OIII if doing a HOO pallette.

Can anyone add any commentary to what I am doing please?