Re: GCR and blacks that have reddish cast
Re: GCR and blacks that have reddish cast
- Subject: Re: GCR and blacks that have reddish cast
- From: Terence Wyse <email@hidden>
- Date: Tue, 10 Nov 2009 17:14:13 -0500
Out of curiosity, why aren't you using SpectralVision to build your
profiles? You'll probably find it does a better job with GCR and
neutrals than ProfileMaker, especially if you use the XRite/Monaco
2,989 patch chart. With any of the x800/x880 Epsons make sure you use
100% GCR with a black start of 0% (L*100 in SpectralVision).
Also, I've always found that, even after setting the total ink limit
in ColorBurst, the profile itself needs some additional total ink
limiting. 260-300% are very typical numbers for me.
Using the Lightness linearization should also net you a small
improvement in profile quality as well.
Regards,
Terry Wyse
Sent from Terry's iPhone
On Nov 10, 2009, at 5:00 PM, david wollmann <email@hidden> wrote:
Hi everyone,
My blacks and 3/4 tones are exhibiting a reddish color cast on our
fine art canvas prints.
The equipment in use: iOne iOTable, ProfileMaker 5, Colorburst Rip
v6.1 and an Epson 9800.
I did the usual routine of printing test files with everything off
to determine ink threshold for bleeding and pooling. Canvas is not
the Epson brand. Once threshold was determined I ran linearization.
Colorburst then set ink limits. ICC targets were printed and read.
The profile looks fine in Colorthink Pro, my printer test image is
also looking good for color, smoothness, and neutral grays. (Its
harder to see the color cast in the black in the small printer tests
but when we do our "small" proofs at 22x27 its much easier to pick
up on the color cast. Finals are 40x50 inches)
Defaults were used in ProfileMaker, large table, paper gray, classic
gamut mapping, and the GCR was inkjet 400 with GCR3.
When we print the clients fine art portraits, clients main work, the
dark backgrounds, which read as a good neutral on the screen, print
with a reddish cast in the blacks. Skin tones are also slightly
redder then our image on screen.
We switched the GCR to Inkjet 260 which uses GCR4 and that fixed the
slight reddish tones in the blacks. The skin tones are better too,
closer to our screen image. This seems to hammer things with a
fairly strong move, may still try using GCR3 to remove less 3 color
black.
This is a "small" gamut material with a compressed dynamic range,
but why are my black tones not staying neutral? Is this common to
use GCR as way to control color cast in the darker colors? Seems
like guess work instead of control? We see the same problem on a
matte paper that has a similar dynamic range and gamut.
Also, is this more a ProfileMaker way of generating neutrals and
blacks? Monaco Profiler generally seems to have better neutrals and
blacks when I use it at my other job. I also see these redder dark
colors out of Onyx using its ProfileManager which I think uses parts
of ProfileMaker.
Thanks for your help,
David
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