This relates to custom curves, mainly Lab L curves and Tone Curve 1 and 2, but could apply to any curve.
I adjust some points, partly using the histogram and what I want to happen, and partly by trial and error, moving the points this way and that to see what looks best. I end up with something I’m fairly happy with. Presumably lots of us do the same? Eg -
Now I wonder if I’ve got the steep part in the optimal place, for example. I’d like to move all the points around together, as a group, except for the leftmost and rightmost. The movement might be up and down, or left and right. I just want to tweak it and see if it makes the image any better. E.g. new points like this -
(RT would draw the actual curve of course, like it does now)
This saves me moving the points one by one, and I can easily get back to where I started from.
I don’t know whether each point would ideally move an absolute distance, or a proportionate amount.
Do you think this could be useful?!