Re: Review of Large-Format Inkjet Contract Proofers
Re: Review of Large-Format Inkjet Contract Proofers
- Subject: Re: Review of Large-Format Inkjet Contract Proofers
- From: Terry Wyse <email@hidden>
- Date: Mon, 12 May 2003 11:16:42 -0400
on 5/12/03 12:33 AM, Graeme Gill wrote:
>
Cris Daniels wrote:
>
> No. The standard black in the 10000CF and the Photo Black in the 10600
>
> UC are only so black. Forget everything else, they just might not have
>
> enough density to use for contract proofing. What is your max black
>
> density needed? If its over 2.0 you are out of luck with the Ultrachrome
>
> or archival inks which both top out around there, it depends on the
>
> paper. The 7600/9600 UC can achieve a smoother gray balance and better
>
> photographic quality, but the black is the same.
>
>
Is the density of the black on its own that relevant ? The minimum
>
L* value of the final profile will depend mainly on your TAC.
>
Even with a setting of 220%, the total CMYK minimum L* value
>
should be enough for nearly any normal (reflective print) situation.
>
(Of course "weird" ink formulations may break this - some ink formulations
>
have the effect of getting lighter beyond a certain point of adding
>
CMY to black. This seems to be media dependent as well.)
>
>
I can't remember a situation in which we had to reject a printing
>
device with a K density of >= 2.0 because it failed to be able to match
>
the target minimum L* value.
You're both right. The CMYK min L* is what matters but the K density has a
lot to do with this. And, in general, I've NOT found the min L* value of
most Ultrachrome printers to be low enough for accurate commercial offset
proofing, especially if an analog/film-based proofed is used as a reference.
Analog proofs will generally show a min L* of less than 10 (6-8 typically)
while the BEST I've seen with UC inks is around 12-13 but is more typically
higher than 15. Now if it's a press profile you're using as a reference, the
situation isn't quite so bad as the min L* can easily be about +5 compared
to the analog proof reference.
Later,
Terry
--
__________________________________
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Color Management Consulting
v 704.843.0858
e email@hidden
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