Diagnosing and remedying overinking in CMYK files
Diagnosing and remedying overinking in CMYK files
- Subject: Diagnosing and remedying overinking in CMYK files
- From: Marco Ugolini <email@hidden>
- Date: Mon, 01 May 2006 20:44:27 -0700
In a message dated 5/1/06 4:03 AM, Giordano Galli wrote:
>> The way I see it, using those values [C 90, M 70, Y 70, K 100] inside
>> a file that has a newspaper profile embedded in it should just be avoided,
>> ideally
>
> Such a colour has, no doubt, to be avoided, as it would invalidate the
> whole file that would then have to be colourimetrically reconsidered.
>
> However, my main concern is the risk of inadvertently exceeding profile
> limits by simply assigning a different profile, using trasparency
> methods like Multiply and Darken or taking colour corrections too far.
Hi Giordano.
Yes, that can happen, and it certainly does often enough to deserve
attention.
> I understand that this is not about color management but I expect newbies
> to have some sort of safeguard expectation once their files are tagged
> and, as regards Photoshop, I'm afraid that the Info palette's ability
> to display credible Lab values for off limits colours is just going to
> reinforce this confidence.
It certainly would be nice if there was some sort of TAC warning in
Photoshop similar to the Gamut warning for colors (though the Gamut warning
is not really truly dependable -- well, I'm digressing). But there is no
such safeguard that I know of.
(Maybe somebody on this forum knows a way to diagnose overinking that
involves some visual-flag method friendlier than just using the eyedropper
and reading the info palette's Total Ink values in different areas of a CMYK
image?)
In theory, shouldn't it be feasible to create a TAC-warning feature for CMYK
files in Photoshop? Granted, the programming of such a feature may not be
easy, and may require more resources than the financial returns in
additional sales numbers would warrant. But would it be prohibitive to set
up the application so that some sort of visual flag alerts the user to the
presence of areas of total ink in a CMYK file that exceed the TAC associated
with the assigned profile?
Which makes me wonder: Adobe, any plans in the works to address this? ;-)
Being that no such safeguard mechanism seems to exist in Photoshop for now,
the solution must rely on an experienced production staff that inspects the
CMYK files and, when necessary, takes the appropriate actions to bring the
TAC values within specs.
'Tain't easy doing production...
Ciao.
--------------
Marco Ugolini
Mill Valley, CA
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