Re: Custom color-separations in Photoshop?
Oh, for heavens' sake, it was Alberto Novo. I should have remembered
that, sorry Alberto. Anyway, here's the page:
On Jan 24, 2009, at 5:14 PM, Katharine Thayer wrote:
Funny, after reflecting on this for a while I was just coming back
to say roughly the same thing Michael just said, that I think
there's still something in the idea of spot channels. I'm trying
to remember the name of the person (on this list, I think) who
showed us color gum prints made by creating his own separations,
which if I remember right were essentially spot color channels
created by selecting colors with the magic wand. I'm just
remembering this vaguely, but I think this guy's work may have been
in the direction you're thinking, Keith. The images were European
city scenes, as I recall, maybe Venice. If the person is here I
hope he'll speak up, or if someone else remembers who this was and
has the link for the pictures/instructions, please chime in, thanks.
On Jan 24, 2009, at 4:32 PM, Michael Koch-Schulte wrote:
No. I think you're on the right track. Damn the "experts". There is
a reason "spot" colour exists to this day and people in the
printing industry know why. There are colours which can't be
produce by just three "primaries" and there are also cases when
primary colours are both not necessary and to be avoided. For
example, mixing quinacridone red and azo yellow will give you "an"
orange but it won't be as saturated or intense as say a benzimida
or pyrrole orange which are both produced independently of either
red or yellow pigments. Many fine art reproductions use multiple
plates. Giclee uses 12 inks not 3.
Keith Gerling wrote:
Forget it. After some reflection and after mulling it over with a
resident PS expert (thanks Mark), it is apparent that what I'm
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
Spot color separations?
No, on re-reading, I think you're talking about something more
sophisticated. In a fairly recent thread, someone pointed to
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
Ah, I found it. The thread subject is "Gum Color Gamut & Beyond
starting September 22, 2008. On re-reading, I'm not sure it
useful information beyond the name of the application (Pantone
that makes the five-color separations. But you might read
through to see
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
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
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.