Note: Many of Print Test’s functions are now performed by Gamutvision. We may deprecate Print Test in a future version of Imatest. Please let us know if you use it and would like it kept.
Dmax = -log10(minimum print reflectivity) is a measure of the deepest black tone a display or printer/ink/paper combination can reproduce. It is an extremely important quality factor. Images with poor Dmax look pale and weak. Dmax = 1.7 is a good value for matte prints; 2.0 is a good value for glossy, semigloss, and luster prints. Epson Ultrachrome K3 printers claim Dmax as high as 2.3 with Premium Luster paper. That would be outstanding.
Dmax is affected by the printer, paper, and ink. The response curve is also affected by the ICC profile. Print Test can help with the selection of supplies and diagnosis of printing problems.