Re: Custom color-separations in Photoshop?
Spot color separations?
No, on re-reading, I think you're talking about something more sophisticated. In a fairly recent thread, someone pointed to software (not Photoshop) that provides separations for two of the secondaries, I think, in addition to the primaries, but I didn't see anything that generates separations for all three. But that thread might be a good one to revisit.
Ah, I found it. The thread subject is "Gum Color Gamut & Beyond CMYK" starting September 22, 2008. On re-reading, I'm not sure it contains much useful information beyond the name of the application (Pantone Hexachrome) that makes the five-color separations. But you might read through to see for yourself.
On Jan 24, 2009, at 9:49 AM, Keith Gerling wrote:
I was wondering if there was any method in Photoshop, or with a Photoshop plugin where one could perform custom color separations. The RGB and CMYK channels are universal ways of splitting a full color image into 3 or four standard colors. Wouldn't it be possible to split an image into components of Purple, Orange and Green, for instance? It would be like turning the color wheel a notch. Conceivably, if all the color information can be conveyed in CMYK, it ought to be accurately conveyed with other color channels as well. Or am I missing something? This could provide all kinds of interesting possibilities for tri-color gum printing.