can you elaborate some more?
You mean a connection between slidersposition and curvetool?
( if you have a choise to lock or unlock coupling tonecurveline-contrast would it be better?)
and i never suggested it was easy.
Now we have a histogram which has a direct view of color (saturation,hue and lightness) and overal luminance (RGB combined) Which is changing appearance when altering/adjusting related tools. (It viewes the image specific’s in a neat overal view)
When i adjust things in that very powerfull tonecurve tool i can misform the image badly just by bending and forming the (adjust)line which is viewed by the Histogram).
(like all tonecurve tools)
If you make a checkbox which just add the contrast changes made by clearview and contrastsliders on a secondairy line (which only views the tonecurve made by those adjustments.) then the curvetool line can be untouched and still be a straight line in default.
If they can add this tonecurve-line as a extra information button in the histogramtool next to sun and moon it is great and add it in the curvetone tool as “ghostline” around the tool-line even better.
Playing with the curvelinetool it self reveals its immediate changing power and thus difficult control by untrained users. so i avoid using it as tool for adjusting, (like using a hand planer because the powerplaner is causing too much unwanted effects in untrained hands)
But the line as information can be very usefull.