Re: 6. RGB o CMYK profile conversions and max total ink
Re: 6. RGB o CMYK profile conversions and max total ink
- Subject: Re: 6. RGB o CMYK profile conversions and max total ink
- From: gariba <email@hidden>
- Date: Wed, 22 Oct 2003 16:31:22 -0200
Hi Rick,
I was trying the conversion with Black point comp unchecked.
I'm saying WAS, because until understand what is wrong, the
conversions stopped.
The possibility that most scares me is the one suggested by Greg, the
scans having a low dmax, because I haven't time to re-scan 430
originals.
And I would like to say THANKS! for every one who is kindly helping on
this issue.
gariba
On Wednesday, October 22, 2003, at 03:23 PM, Rick Gordon wrote:
Another factor I haven't seen mentioned here is Black Point
Compensation. My experience is that with BPC enabled you may not quite
reach the full TIL (but close) upon converting a r0,g0,b0 value, while
with it disabled, you will.
Rick Gordon
P.S.: Greg, are you related to Tom Rettig, formerly of Broderbund
Software, and son of Tommy Rettig of Lassie fame?
------------------
On 10/22/03 at 7:47 AM -0400, Greg Rettig wrote in a message entitled
"Re: 6. RGB o CMYK profile conversions and max total ink":
Hello Gariba,
Your profile maybe just fine. To check the profile and how it
converts you need to create a RGB vignette in photoshop that has a
range of 0 to 255RGB. Leave enough room at the 0 and 255 point to
take a reading. The 0 end should come in at 360% and the 255 end
should come in at 0% ink. You can then read further down the
scale(vignette) and find the 320% number, most likely somewhere
around 235-240 RGB. In other words, your scanner is setting the
d-max low or the images you are scanning do not have very dense >> black.
A grey elephant on sandy beach won't produce a scan that ranges from
white to black and you won't have any 360% ink limit any where in
such an image. This vignette "grey scale" image should have equal
amount of RGB through out and should appear grey on your screen and
when proofed.
Greg Rettig
--
___________________________________________________
RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
___________________________________________________
WWW: http://www.shelterpub.com
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