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Old 01-17-2007, 06:36 PM   #1
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Default Converting CMYK images to spot


I work for a printer where we do both digital and offset printing. Quite often clients will bring in a job that is to be printed as one or two colours, but their logo/artwork is in a CMYK build.

My question relates to converting an image that is built in CMYK to spot. Converting to CMYK from spot is very easy, but I am yet to find a method of changing it back the other way apart from sometimes dragging a spot swatch onto the image, which changes the colour, but often creates a screen. The software I am using is InDesign CS2, although I have Photoshop, Illustrator, and Quark 6 here too.

Any help would be appreciated.
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Old 01-19-2007, 09:11 AM   #2
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I'm not aware of a software that can do that. I'm pretty sure you will have to rebuild in photoshop and/or illustrator, especially if it has multiple colours. If the logo is an image, and there is only one colour in the logo, you could rasterize into photoshop and make it a monotone.


Last edited by roaryg; 01-19-2007 at 09:13 AM. Reason: Add third sentence.
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Old 01-19-2007, 12:41 PM   #3
don Arnoldy
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Originally Posted by Digi View Post
Converting to CMYK from spot is very easy, but I am yet to find a method of changing it back the other way...
If you're lucky, the spot color will have a 100% component of one of the process colors--then you could simply use that plate for the spot color (I'm hardly ever that lucky).

Depending on how they created the color, you may be able to redefine the swatch(es) to 100% C, then just use the black and cyan plates.

Most of the time, though, you're just screwed. No good way to fix it.

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Old 01-20-2007, 08:59 AM   #4
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If the file is in Illustrator you can easily change the CMYK colour to SPOT and when you import it into Quark the spot colours are added to the colour palette.
For Photoshop files you can change the file to Duotone or Multitone to get your spot colours, but you have to export as a DCS eps to retain the spot colours an ordinary eps will convert the spot back to CMYK.
Hope that helps.
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