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

Re: Custom color-separations in Photoshop?

That is an interesting use of the B&W app.  I'll have to look into that.

The reason why my original thought about custom separations is not
feasible is that one cannot get any pure primaries - red, yellow, blue
- from a pallette that uses purple, green and orange.  I'm thinking
that Hexachrome separations might be interesting. Or, use a custom POG
seperation and then use spot channels to add the primaries where

On Sun, Jan 25, 2009 at 11:22 AM, Marek Matusz <marekmatusz@hotmail.com> wrote:
> CS3 has this advanced B&W filer method tthat allows application of any color
> filters to a B&W image. While I do not understand the math, or principles, I
> use it occasionally to creat a spot color (say orange) negative. I wonder if
> in principle it could be used to create orange/green purple negatives for
> example.
> Marek
>> Date: Sun, 25 Jan 2009 08:16:26 -0800
>> From: kthayer@pacifier.com
>> Subject: Re: Custom color-separations in Photoshop?
>> To: alt-photo-process-l@usask.ca
>> Thanks, Alberto. After I sent that first post, it occurred to me
>> that maybe I'd bookmarked the page, and sure enough there it was in
>> my bookmarks. Anyway, I don't think anyone talking about using spot
>> channels to achieve Keith's goal is supposing it could be an
>> automatic process like default Photoshop CMYK separations; Keith is
>> right that Photoshop won't do that. But it is a way to use Photoshop
>> to get the separations of secondary colors that he wanted.
>> Katharine
>> On Jan 24, 2009, at 11:54 PM, Alberto Novo wrote:
>> >> Oh, for heavens' sake, it was Alberto Novo. I should have
>> >> remembered that, sorry Alberto. Anyway, here's the page: http://
>> >> www.grupponamias.com/index_en.html?http://www.grupponamias.com/
>> >> art_101_en.html
>> >>
>> >
>> > Never mind, Katherine. I live in a different time zone, so usually
>> > I can't chime in at once.
>> > I would add that I don't believe that my process could become an
>> > atomatic one, though it is possible to make a Photoshop action. The
>> > reason is that the colors are not primary (I like to call them
>> > oblique, opposed to orthogonal, because they are not complemetary,
>> > and they are not the resultant of a rigid rotation of the axes),
>> > and they vary from picture to picture because of the complexity of
>> > the scene and the personal choices of the operator.
>> > Alberto
>> >
>> >
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