Re: CMYK settings
Re: CMYK settings
- Subject: Re: CMYK settings
- From: Roger Breton <email@hidden>
- Date: Thu, 29 May 2003 08:49:51 -0400
>
How can I decipher such data as dot gain, GCR, black
>
generation, total ink limit from a custom CMYK profile
>
or one that comes with Photoshop such as SWOP Coated
>
V2?
>
Is there an application out there that does that and
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would also help me edit the data?
>
>
Thanks,
>
Faro
One thing you could do -- I have done that many times to 'reverse engineer'
some CMYK profiles -- is to create a Lab neutral ramp, from 0 to 100, in
steps of 10. Convert this Lab ramp to the CMYK profile you want to study
using whatever conversion settings you like. Then, using some graph paper,
label the vertical axis 'screen percentages' (from 1% to 400%) and the
'horizontal' axis Lightness (from L=0 to L=100). Find some Prismacolor
crayons. A cyan, a magenta, a yellow and a black ought to do. Now, back in
Photoshop on your converted ramp, select the color picker tool (5x5 area)
and position it to read what was L=100 and observe the converted CMYK
values. Ideally, these should all be zeroes. Next, read what was L=10 and do
the same thing. Plot the read CMYK % on your graph using your Prismacolors.
Repeat the same process for all your patches in your ramp until you've
reached L=0. If you link all the color dots on your graph with the
corresponding Prismacolor crayons (use cyan for all cyan dots, etc.) you'll
end up with four curves who correspond to the process separation. And that's
where the learning begins for you. For one thing, you'll discovered that
black never starts at 5, 10, or 20% but somewhere further towards 45 or 50%.
What I suggest do is you download and study all the TR-001 profiles from
Chromix. You'll get a better idea of all these separation parameters after
you study those.
Regards,
Roger Breton
Laval, Canada
email@hidden
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