Mapping Pro split tone printing

I am curious as to how shadows, midtones, and highlights “generally” map against, lets say, a photoshop adjustment layer using luminosity values. For example do the shadows sliders “generally” map from L=0 to ~33, midtones ~33-~66, and highlights from ~66-100?

I am trying to understand when I look at the histogram for a photo how I can map that to the QTR settings for shadows, midtones, and highlights to give some sort of “pre-visualization” ideas on the the print.


yes. These are “straight line” maps (not curves).