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Originally Posted by rrc62 |  | | | | | | | | | In Photoshop they are...
C = 47.4/108.4
M = 47.4/161.6
Y = 50/90
K = 53/45 | |  | |  | |
Those photoshop numbers listed are for 300 DPI separation. When the default resolution is changed to 1200 DPI they become.
C = 54.2/108.4
M = 54.2/161.6
Y = 57.1/90
K = 60.6/45
In the photoshop screen dialog, there is an option to "accurate screens". This option is only for use with accurate screen technology. This is a feature where the RIP can dynamically modify its resolution to allow for the creation of the requested screen values.
Even for programs like Corel, when printing on a postscript printer the halftone screens will be changed to an adobe screen nearest equivalent. This is what makes entering screen values rather than accepting the values of the PPD or Adobe automatic selection gets tricky. While the numbers listed in books might make sense, it is very unlikely that those numbers will be maintained unchanged as the file is sent to a postscript printer. Postscript will always do what it is going to do because mathematics forces it to be that way.
A simple way to think of this imagine a staircase with the steps rising at a 45 degree angle. The only option to climbing the steps is to take the steps 1 at a time, 2 at a time, 3 at a time... Trying to climb the steps in 10 steps can only happen if the number of steps is divisible by 10.
fred