Re: dot gain in appliocations
Re: dot gain in appliocations
- Subject: Re: dot gain in appliocations
- From: "Jouni Marttila" <email@hidden>
- Date: Thu, 22 May 2008 15:15:10 +0300
Hello!
One thing you must take into consideration is that dot gain calculated from
densitometric values and from XYZ values can be different. E.g. for typical
coated fine paper in offset correction factors are 1.25 for cyan, 1.05 for
magenta and 1.0 for yellow and black. So with XYZ values cyan will look to
have lower dot gain.
Br Jouni Marttila
2008/5/21 Legnani - Fineartprint.it <email@hidden>:
> Hello List, I'm a photographer and color specialist (another Bruce
> Fraser son), working with an editor in high-end illuminated book
> reproduction. I shoot and follow the entire color workflow, from input to
> output, I produce and edit the proofs (with one profiled Eizo CG-19,
> calibrated light – GTI – and Oris Color Tuner with Epson 3800) directly in
> the museum face to face with the original. The proof and printing system is
> calibrated by me; together with the printer we do tests with visual files,
> ECI 2002, TAC etc to find a good paper/ink combination (we always use
> stochastic screening).
> As regards the printer, every time he prints a test and before printing a
> book with the relative ink/paper combinations, he calibrates the CTP with a
> specific software that targets the FOGRA characterizations. Since we use
> many different papers/inks, we generate our own profiles.
> The topic of my work is now this: I read the testchart with Measure Tool; I
> then have to decide on the right ink/paper combinations, by also evaluating
> the dot gain curve shown by Measure Tool and ColorThink. The two dot-gain
> graphic representations are quite different, (I know that dot gain is
> converted into status T-density in Measure Tool and is in XYZ in ColorThink)
> so my questions are:
> Are the graphic representations the same between ColorThink and Measure
> Tool?
> Or perhaps in ColorThink they represent "something" (adjustment) after the
> profile construction?
> Is there another software package on the market that is able to read test
> charts and graphically evaluate dot gain for cmyk profile?
>
> Thanks to everyone for sharing their knowledge
>
> Roberto Legnani
> Bologna Italy
> www.fineartprint.it
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