Re: Preserving the black channel
Re: Preserving the black channel
- Subject: Re: Preserving the black channel
- From: Terry Wyse <email@hidden>
- Date: Sat, 13 Apr 2002 10:21:27 -0400
on 4/13/02 9:20 AM, Lee Blevins wrote:
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We are using inkjet (hp5000) for graphic arts proofing.
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We rip our files in our rampage and output a large contone (cmyk) to
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print.
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Problem is,
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Black only halftones come out in 4C.
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Using Postershop, Monaco Proof.
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We really need the black only things to remain black only.
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Any suggestions?
Using the RAMproof Contone option I presume. Where exactly are you applying
ICC Profiles? Are you using the Rampage ICC Option or are you opening the
CMYK Tiffs in Photoshop and doing the conversion there? Although I know that
Rampage ICC has the option for maintaining 100%K, it obviously doesn't apply
to screens of black. (Oops! I just read your post more carefully and realize
you're doing the conversion in Postershop - duh!).
With your current workflow using ICC profiles there's no way to do what
you're asking. The ONLY way that I can think of would be to avoid profiles
altogether and try to linearize/calibrate your HP5000 via Postershop using
simply density/ink limiting adjustments and dot gain compensation curves (I
have no idea if you can even do this in Postershop - with a BestRIP this
could be done and still be able to bypass profiles). This would get you
close except the ink hues on the HP are likely to be way different than your
press simulation. This would however let you output "straight" CMYK data
thru the HP.
So...
* Use ICC profiles and get the correct color APPEARANCE (%K->%CMYK) but get
an incorrect MECHANICAL proof or...
* Disable profiles in Postershop and get a correct mechanical proof (%K->%K)
but accept the fact that the color appearance will not be correct.
Yet another case of needing a "Smart CMM" or equivalent.
Terry
_____________________________
Terence L. Wyse
Color Management Specialist
All Systems Integration, Inc.
http://www.allsystems.com
email@hidden
_____________________________
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