I have printed 21 step scales to verify midtones. K6/QTR w/HDcurves/Han. PhotoRag 308 The midtones look/sample at about 59% White paper reads 2-4% and black areas read 86-88% (I haven’t put in the new HD blacks yet, so that should improve)
Photoshop is set at Grey2.2
I worked out that using a Levels adjustment layer with the midpoint set to 1.3 delivers spot-on prints, where the 50% tile reads 50% and exactly matches other graphic arts reference greyscale samples. The other tiles read exactly or very close to their expected percentages, but with the black and white a bit off as noted.
My workflow may be more subjective than recommended. I do not have a spectrometer to sample prints. I use a good scanner with no adjustments and test in Photoshop, plus visual/eyes to evaluate results.
Is it a problem that I need the Levels 1.3 adjustment? If so, where am am I going wrong in the workflow?