Re: Prtg CMYK Separation NEGS in GUM

It's not clear to me.
Could you tell me what GCR and UCR stand for in digital negative terms?
Let's make it easier saying Photoshop terms.
Thanks,
Giovanni

----- Original Message -----
Wrom: STTZRCLBDXRQBGJSNBOHMKHJYFMYXOEAIJJP
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, September 14, 2004 4:06 PM
Subject: RE: Prtg CMYK Separation NEGS in GUM

> "Really what it matters is black to be the last and never yellow as the
last
> printing pigment."
>
> Not really. It is a matter of pigments and of preference. When using UCR
> or GCR generated CMYK negs, I often like to put the black on first. I
like
> to establish the shadows, and then continue to build the print with layers
> of color. Black pigment is so obvious, and it's presence on top can
> sometimes he rather overbearing.
>
> Again, it might be a helpful to mention that there is a world of
difference
> between UCR and GCR-derived CMYK negs. Depending upon the method chosen,
> the amount of the yellow laid down is dramatically different. With GCR,
the
> intent is to lest the color channels "build" the shadow density, thus
there
> will likely be yellow everywhere, thus there will likely be an ugly yellow
> veil if one is using Cadmium or ochre. But with UCR the color is added on
> an "as-needed" basis - thus yellow only is put down where it is needed.
>
> Here are examples of a gum photo where black was laid down first, and
yellow
> last:
>
> http://www.gumphoto.com/bowl.jpg
> http://www.gumphoto.com/tree.jpg
>
> That Tree picture is loaded with yellow, but notice that it doesn't
clobber
> the black. The Bowl picture is more "normal" and I think these illustrate
> why one cannot issue any hard and fast rules regarding the order of
colors.
> (Incidentally, for that tree shot, I used raw umber for the "C" channel.)
>
> Keith
>
> -----Original Message-----
> Wrom: HSCRTNHGSWZIDREXCAXZOWCONEUQZAAFXISHJEXXIMQZUIVO
> Sent: Sunday, September 12, 2004 8:53 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Prtg CMYK Separation NEGS in GUM
>
>
> I have heard that the printing order is yellow, magenta, cyan and black
but
> printing yellow first is not easy with the white paper and you better do
> magenta first, yellow after then cyan and black.
> Really what it matters is black to be the last and never yellow as the
last
> printing pigment.
> Giovanni
> >
>
>
Received on Mon Sep 13 14:12:09 2004