Close
kiowa said:
Grays pick a hue because of the color error of scanners, so why not just correct that in tone curve adjustments? Desaturating all grayish areas sounds quite dangerous to me.
Try adjusting gray~black with RGB tonecurves. not only it unexpectedly changing values depend on papers, also it causes awful hue shift. I was triyng adjusting saturation with RGB tonecurves in years, but keep failing.

anyway the primary aim of using HSB curves is to saturate only vivid colors keeping grayish colors and skin colors not saturated. you know, just adding saturation brings oversaturated skin colors.
take a look at post #152369 and other scans of this pool implemented a trial HSB curves adjustment action. red is very vivid but the skin hasn't reddish tones. RGB tonecurves can't get these results (with dull colored poor magazine scans)