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Article #152

Re: Preparing files for print

#152
From: Marco_Ugolini
Date: Sun, 22 Mar 2009 22:51
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      I don't understand the above settings as I thought that all that information
      was captured in the .icc profile that I was supplied.




You are correct. TAC (Total Area Coverage), dot gain/TVI (Tonal Value Increase), GCR, UCR, UCA, are all "rolled in" into the profile's own LUTs (Look-Up Tables).

The CMYK values that the profile generates upon conversion from, say, an AdobeRGB file will already, and precisely, account for all those factors.

So, if the profile is what you are being asked to use for your conversions, the rest of the information should be somewhat redundant.

One thing you could do, though, is to check and make sure that the profile actually *does* generate the TAC it is supposed to. If it turns out to be 320%, for example, then the profile is not correct for the stated press conditions, and you should make that known to your counterparts.

If you have ColorThink Pro, you can also view the profile's neutral rendering curves and inspect its black generation by looking at the black curve in the graph.

      This is my first experience in a colour managed workflow so I may be getting
      a bit confused. If the above settings are not in the .icc profile then
      where do I set them in Photoshop?




They are not "settings in the ICC profile". Once the profile's LUTs (Look-Up Tables) are "baked in" at profile creation time, those "settings" disappear and become implied in the CMYK numbers that the conversion produces -- effectively invisible as "settings", unless you have a profile inspection tool like the already-mentioned ColorThink Pro.
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Subject: Re: Preparing files for print
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Date: Sun, 22 Mar 2009 15:51:47 -0700
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