U of S | Mailing List Archive | alt-photo-process-l | Re: Gum Separations Using Indexed Color

Re: Gum Separations Using Indexed Color

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: Gum Separations Using Indexed Color
  • From: Keith Gerling <keith.gerling@gmail.com>
  • Date: Fri, 02 Jan 2009 10:27:53 -0600
  • Comments: "alt-photo-process mailing list"
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I had discussed using spot color channels in order to add vivid and
bright additions of color in cases where my three-color gums were
using a muted pallete.  It works, but couldn't help but think that it
would be easier to just hand-color the images.

I'm not sure why indexed-color would give you an advantage with opaque
colors.  Did you try it?


On Wed, Dec 24, 2008 at 9:11 AM, Michael Koch-Schulte <mkochsch@shaw.ca> wrote:
> Has anyone experimented with using Photoshop's "Indexed Color" function to
> produce colour separations for Gum Bichromate? Or, mixed Indexed Color with
> CMY(K) separations? Seems someone (Keith Gerling maybe?) was doing something
> similar with adding extra channels to print pure colours. Indexed Color
> would allow one to use opaque inks. I'm going to give this a try over the
> holidays but would like to hear experiences from anyone who has done
> advanced colour separation techniques. Thx. Merry Christmas.
> ~m