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: david wollmann <email@hidden>
- Date: Tue, 10 Nov 2009 15:38:49 -0700
Thank you for your response.
The client owns ProfileMaker. We were using SpectralVision Pro just
for reading the linearization files, a hold over from a previous
consultant and workflow. I'll give it a try with building the
profiles as well.
I also see in the StudioPrint RIP ink limiting numbers around 300%,
so that all seems reasonable. I guess I should have kept that in mind
when using ColorBurst. Their different way of reporting ink limiting
was throwing me off a little and I was not thinking of limiting the
profile.
I agree with using the Lightness setting in ColorBurst when doing
linearization. That is the way we are currently building linearization.
Thank you very much,
David Wollmann
On Nov 10, 2009, at 3:14 PM, Terence Wyse wrote:
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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