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-----
From: gdimase@hotmail.com [mailto:gdimase@hotmail.com]
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 12:07:01 2004