If you are doing some custom workflows and ink segmentation, you may wish to print this 256 level grey scale as an ultimate test to the quality of your results. A 21 step, even a 100 step curve will not show flaws that Will be observed in your photographs. http://www.engr.udayton. edu/faculty/jloomis/ece563/notes/color/GrayScale/grays.html Best, Alex Orlando
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When 21 steps is not enough
2003-11-08 by B. Alex Pettit Jr.