Improvement in handling "tone curve" (Lab)
Many times I need a straight curve in the a- and b-channel with more incline than the diagonal. It took me some time to figure out to get this form of curve, without a smoothing spline.
In the blog "Mastering color with Lab tone curves" I found an older screenshot.
Here exist small triangles at the bottom of the curve display.
I propose to enable one sliding triangle at the bottom left corner and one at the top right corner. Moving this triangles should move the starting point of the curve without smoothing the curve.
Here an example with two sliders at the bottom: