When printing screenshots alongside black text, black areas of the screenshot look a
washed out“muddy dark grey” and “washed out”.What causes this and can I improve the black color area?
Answer
During the RGB ⇒ CMYK conversion your RGB(0,0,0) values are probably converted to Rich black = CMYK(63,52,51,100) or such; and looks washed out when compared to Plain black = CMYK(0,0,0,100)
Solution is to fine tune the RGB ⇒ CMYK conversion.*
See also: Rich black versus plain black and gd.se question: What is the difference between CMYK and RGB?
*) To maximize black (= K = Key) in Photoshop: Edit → Convert to profile → Custom CMYK… → Black Generation: Maximum
But this and other settings should, of course be set according to your media and printer.
Attribution
Source : Link , Question Author : e100 , Answer Author : Community