Re: Approval and ICC
Re: Approval and ICC
- Subject: Re: Approval and ICC
- From: Jim Mitchell <email@hidden>
- Date: Fri, 10 Nov 2000 15:23:36 -0600
- Organization: The Richards Group
Joe Borne wrote:
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The Kodak Approval was designed with one purpose in mind - to create a
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digital proof that was a legitimate replacement for analog film proofing.
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The Approval creates a faithful dot-for-dot representation of exactly how
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the job will plot on film. When this device is employed it's primary purpose
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is to allow technicians and savvy clients to actually look at dot structure,
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screening, rotation, rosette and density. If you apply a profile, no matter
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how perfect it is, it will invalidate the entire reason for using the
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Approval in the first place.
So Joe, your saying that good color or match color is a function of dot structure,
screening, rotation, rosette and density. Interesting I thought matching color was
about matching color. Approval is a great machine but because of the different
colorants used in proofing systems and printing systems, using an ICC profile is
the best tool available for achieving the holy grail of match color.
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A profile by nature disregards percentage data in favor of a remix of colors
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that give a better visual representation. A profile will adjust the
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percentages of color in each channel individually in order to achieve better
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visual representation of a Lab value. If clients are given an Approval proof
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that has had a profile applied overtop of it, they are being given a false
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proof.
This is why pressmen take hours to match a proof that even though the dot gains and
density match they can't hit. Printers match to color, if they had a better proof
that was a better visual match they would spend less time on make ready. Saving the
customer more money. I'll take a false proof that has a better visual match than an
accurate dot and density proof that doesn't match any day.
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The dots on the page will not be anywhere close to what will happen
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to that data on film or plate.
In a few years most of us won't care about dots, well be going for a visual match.
As ink jet gets better you'll see more Iris and Dupont ink jet proofs at press side
as you do now.
Now I do agree with Joe that every effort should be used to get as close as
possible by using density and dot gain. But when you have gone as far as you can
with dot, use a Black Channel preserving device link profile and I'm sure you'll be
impressed and your customers delighted, I know mine are.
Jim Mitchell
Color Systems Manager
The Richards Group