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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