Re: Dumb question for european prepress specialists: Which profile?
Re: Dumb question for european prepress specialists: Which profile?
- Subject: Re: Dumb question for european prepress specialists: Which profile?
- From: Paul Schilliger <email@hidden>
- Date: Sat, 26 Nov 2005 08:53:03 +0100
Marco Ugolini wrote:
In a message dated Fri, Nov 25, 2005 10:58 PM, Paul Schilliger wrote:
In Adobe's I can't even find a way to preview what the image looks like in
plain CMYK values. It will always compare to the default CMYK profile set in
Color preferences. It could be that I am missing something, is there a tip
there? How can I preview for example what plain CMYK values look like in my
monitor profile?
Please forgive me for appearing brusque, Paul, but to talk about "plain CMYK
values" is meaningless. Unlike CIELab, CMYK is always a device-dependent
color space: the appearance of color in a CMYK file is always based on the
specific color behavior described in the profile associated with the file
(which is the default CMYK profile for untagged files), and this color
behavior changes from profile to profile and from device to device. The same
color numbers describe notably different colors in different profiles.
If you wish to preview the CMYK values in your file, there is no getting out
of first *having* to define what kind of CMYK values these are. That is why
Photoshop, in the absence of any other instructions, *must* resort to using
the default CMYK color profile defined in Photoshop's color preferences.
Conversions are based on math, and without defined values no math is
possible.
Regards.
--------------
Marco Ugolini
Mill Valley, CA
Marco,
You are not brusque at all and I appreciate your explanation! I was expecting
this answer for it is true that a preview is by definition related to a media.
For instance RGB values are related to light and CMYK values to paper-ink
combination. In fact I am trying to understand what printers want. In one
occasion, I tried to talk about it with a printer. We sat by his computer
and he opened a file that I had made and that contained a profile. He discarded
the profile at opening and took his measuring tool. He measured a patch that
was supposed to be 50% Magenta. Of course it wasn't 50% Magenta any more,
for without profile, the values were misinterpreted. But basically his talk
was this: If you want me to restitute 50% Magenta on the paper according to
the printer's color charts, there should be 50% Magenta in the file. He wanted
plain CMYK values and was ready to make the necessary adjustments to get
that on paper. What should I have done then?
Regards
Paul
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