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Here's another thing that's keeping me stuck using PS for the near future, as I haven't found a suitable replacement in another application... I require precise adjustments of curves for when I create calibrated contrast correction for alt process photo printing. I regularly print using gum pigment (aka, gum bichromate), kallitype, gumoil and cyanotype techniques. The overwhelming majority of my fine art prints are done this way. To get the best results, it is necessary create compensation curves to correct for the deficiencies of the print process. They are all different, and ideally one would create individual curves for each kind of paper used, as well as for the different processes. I feel confident saying this is the common practice amongst alt process photo printers these days, so I'm certainly not the only one who would benefit. A full description of the process I use can be found here: https://www.freestylephoto.biz/alternative-process/making-digital-negatives Please take special note of Figures H and I in the article because these illustrate exactly what I'm needing to do with curves. What I need is the ability to precisely input the required I/O numbers into the curves dialog. Not only do I not see any way to do this in AP's curves, I don't even see any sort of scale that would clue me in to where I am on the curve. I am able to read gray values the way I need with the eyedropper, but without being able accurately translate those numbers to a curve, I'm stuck with only half the tools I need to do this.