Converting RGB to Duotone Cyan and Black

2003-12-22 21:10:20

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?

@John_Slate

2003-12-22 21:20:13

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.

@Brian_Issa

2003-12-22 21:34:52

Sorry, I'm a bit of a novice in PS. How do I fill the channels with White as you suggested?

@Mathias_Vejerslev

2003-12-22 21:50:40

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