U of S | Mailing List Archive | alt-photo-process-l | Re: Custom color-separations in Photoshop?

Re: Custom color-separations in Photoshop?

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: Custom color-separations in Photoshop?
  • From: Keith Gerling <keith.gerling@gmail.com>
  • Date: Sat, 24 Jan 2009 16:52:54 -0600
  • Comments: "alt-photo-process mailing list"
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Forget it.  After some reflection and after mulling it over with a
resident PS expert (thanks Mark), it is apparent that what I'm looking
for is impossible.  There is a reason they are called Primary Colors!

I will check out the Hexachrome thread, though.

On Sat, Jan 24, 2009 at 12:22 PM, Katharine Thayer <kthayer@pacifier.com> wrote:
> 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.
> Katharine
> 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.