Re: Bronzing
Re: Bronzing
- Subject: Re: Bronzing
- From: Steve Upton <email@hidden>
- Date: Thu, 5 Jun 2008 15:34:45 -0700
At 5:53 PM -0400 6/5/08, Todd Shirley wrote:
>Does anyone have and ideas on how to reduce (or totally eliminate) bronzing effects (gloss differential) on Epsons using Ultrachrome K3 inks? We use ORIS ColorTuner to drive two Epson 4800s, one printing on Epson Premium Photo Semi-gloss, the other on ORIS PearlPROOF Super Semi-Matte, and they both show a rather nasty gloss differential. You have to look at the proofs at an oblique angle, but when you do the bronzing effect really pops out. When I print the same image direct from photoshop to the driver (skipping the RIP), it is less pronounced but still present. We are definitely using the photo black in both printers, which is supposed to reduce this issue, but it looks pretty bad on images that go through the RIP
>
>The gloss differential happens right around the quarter-tones. Total ink areas of about 20-50% are much shinier than the highlights and darker colors, so when viewed obliquely they look weird. In the past we didn't think there much we could do, but recently we received some inkjet proofs on what appears to also be Epson Photo Semi-gloss and there is absolutely NONE of this gloss differential. Unfortunately we cannot contact the supplier of that proof.
Hi Todd,
This sounds like something you may be able to reduce with different GCR.
Have you looked at a separation in Photoshop using the profile? I'd be interested in the amount of K in the problem areas.
I'd bet that the Epson driver uses less K in the highlights.
You could rebuild the profiles with a later K start or perhaps a lighter GCR. This will make highlight neutrals more dependent on CMY balance so you may need to increase the CMY-only highlight patches when profiling. With Monaco that means bigger targets, with PM5 you may be able to increase the sampling in the highlights without making the target too much bigger....
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
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