Tone curve should reflect what the selective tone sliders are doing

[Joanna (Joanna Carter)]

The problem is that the Selective Tonality sliders do not apply corrections in the same linear fashion that the Tone Curve does. See this post and others on the same subject…

Selective Tone / Highlights too "broad"

I’ve just created a graph of luminance values taken from the left, centre and right of each of the stripes in the test pattern, showing the differences when the Black slider is boosted to +100 and the Highlights slider is cut to -100 [Capture d’écran 2022-03-22 à 10.53.36] For the Black + 100 adjustment, the first stripe remains at 0, which makes me wonder why it is called Black, since that stripe doesn’t get altered in any way. Then, subsequent stripes do not change equally but, instead, as a…