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: Scott Martin <email@hidden>
- Date: Tue, 10 Nov 2009 16:53:58 -0600
Terry is (as always) spot on. The key here is having ideal separation parameters for that particular printer/paper/ink limiting setup. SpectralVision's presets are great for use with ColorBurst on that printer. MonacoProfiler is also fantastic with the right parameters (the default presets aren't). I actually have the SpectralVision parameter presets (built by ColorBurst) for MonacoProfiler if anyone wants them.
Scott Martin
www.on-sight.com
On Nov 10, 2009, at 4:00 PM, david wollmann 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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