Converting RGB to Duotone Cyan and Black

BI
Posted By
Brian_Issa
Dec 22, 2003
Views
543
Replies
3
Status
Closed
I currently have a map in RGB that has several shades of black and cyan(actually their RGB approximations) in the symbology. This map is to be printed in only Cyan and Black. What I need is to have this converted to CMYK using only the C and K (no magenta or yellow!) Simply deleting the channels does not produce acceptable results. Is there a way to convert to CMYK using only C and K? There aren’t that many individual colors, is there a way to set the CMYK values for each swatch and have it update the entire file appropriately?
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black conversion cyan duotone rgb

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JS
John_Slate
Dec 22, 2003
First I would convert to CMYK with maximum GCR to avoid CMYK blacks.

Then you will need to adjust the curve of the cyan channel as it will probably not be 100% where it needs to be.

Then fill the Mag and Yellow channels with white, don’t delete them.
BI
Brian_Issa
Dec 22, 2003
Sorry, I’m a bit of a novice in PS. How do I fill the channels with White as you suggested?
MV
Mathias_Vejerslev
Dec 22, 2003
Check out this thread, Burtons suggestion of PowerTone in particular; <http://www.adobeforums.com/cgi-bin/webx?128@@.2ccefa93>

Although an expensive product, it lets you do a couple of trials.

Mathias

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