Re: Bronzing
Re: Bronzing
- Subject: Re: Bronzing
- From: MARK SEGAL <email@hidden>
- Date: Thu, 5 Jun 2008 16:24:23 -0700 (PDT)
Todd,
Gloss differential and bronzing are two different effects: gloss differential appears on glossy paper surfaces when no ink is laid on certain areas of the image, so you are seeing the difference between the paper surface with and without ink. If you can manage to keep the highlights to L values no greater than about 240~245, this will mitigate the problem substantially. If you can use matte media it will help even more. If you cannot use matte media, something like Premier Gloss Optimizer (a spray) would be the way to go.
Bronzing is another issue. It is caused by the non-neutral mix of the CMY inks, producing - well - slightly warm blacks which look tinged with "bronze". Yellow is usually the culprit, and ImagePrint addressed this by eliminating Yellow in its profiles for B&W prints at the time it was an issue with the Epson 4000. Epson added another grey and made certain other modifications for the 4800 and K3 inkset which were supposed to minimze this effect. If you still find it too prominent for your B&W work, the real solution is to print using the ABW mode of the Epson Driver (Version 5.5.1) which I believe is present for the 4800 (I know for sure it is in the 3800). The ABW mode is configured specifically for Black and White work and uses no C, M or Y ink altogether, so brozing cannot occur.
Mark
----- Original Message ----
From: Todd Shirley <email@hidden>
To: 'colorsync-users?lists.apple.com' List <email@hidden>
Sent: Thursday, June 5, 2008 5:53:15 PM
Subject: Bronzing
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.
Any pointers would be greatly appreciated. We are currently doing a
big job of 4/C black & white images and the client is killing us on
this issue, especially when they have proofs from other vendors that
don't display this problem.
Thanks!
-Todd Shirley
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