Re: Soft Proofing Newsprint in Photoshop
Re: Soft Proofing Newsprint in Photoshop
- Subject: Re: Soft Proofing Newsprint in Photoshop
- From: Ricardo Posser <email@hidden>
- Date: Sun, 9 Feb 2003 14:07:35 -0300
I'm having the same problems. Some times i have a profile that shows no
difference between 100% in black and 100% in the CMYK, but when i use
Black Ink the difference appears, but to washed out.
What it is strange is that some profiles shows the black difference
without using Black Ink. And don't get washed.
And the same profile worked on Photoshop 5 i think.
I use profilemaker, how can i solve this using this software ?
What it is strange is that some profiles shows the black difference
without using Black Ink. And don't get washed.
Regards,
RIcardo Posser
On domingo, fev 9, 2003, at 03:00 America/Cayenne,
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Today's Topics:
1. User Group Recommendations? (Dan Husted)
2. Proofing Pantone (Matthew Kelly)
3. Re: some thoughts on CIELAB (Bruce J. Lindbloom)
4. Re: Soft Proofing Newsprint in Photoshop (email@hidden)
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Message: 1
Date: Sat, 08 Feb 2003 11:14:23 -0500
From: Dan Husted <email@hidden>
Subject: User Group Recommendations?
To: email@hidden
Hello All,
I was wondering if anyone could recommend user-group(s) pertaining to
digital imaging on a professional level, i.e. issues relating to
scanning,
processing, and inkjet output. I have a few questions that would be
out of
gamma with this group:) Thanks in advance!!!
Best,
Dan
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Message: 2
Date: Sat, 8 Feb 2003 12:39:21 -0600
Subject: Proofing Pantone
From: Matthew Kelly <email@hidden>
To: email@hidden
I know that this subject has been dealt with many times on this list,
so excuse me for being redundant with this, but I need to verify what I
have read in the past.
We are a commercial printer currently using AGFA's Sherpa 43 as our
large format proofer, and have been getting fairly good results, with
the profiles we have made, matching our presses. Using that proofer
for Pantone simulation has caused problems with customers'
expectations, even though we mark the proofs as being a process
simulation of the Pantone color. What we would like to do is present
the customer with some definitive information as to what are the
limitations of a CMYK proofer.
If I may get some information on the following:
1) What percentage of Pantone colors fall within the average CMYK
color gamut that are within a Delta 2? (It is my understanding that
the human eye cannot perceive any color difference in colors that have
less than a Delta 2 variance.)
2) I am aware that Pantone colors vary in dot gain on the press. What
curve is applied in Photoshop to each channel of the duotone to render
gain, and what curve is then applied at the RIP for the proofer? Does
the RIP of a CMYK proofer convert the Pantone color in the duotone to
CMYK and print according to the profile information?
3) What suggestions might one make for a large format proofer that
will do a better job of proofing Pantone colors? I have a leaning
toward the Roland HI-FI, using a Best Colorproof. I would prefer a RIP
that accepts PDF 1.4, though we can send a Delta list. Since we are a
production facility, our number one requirement is support for the
equipment. We are located in San Antonio, and finding qualified
personnel to repair large format proofers is a problem.
Thanks,
Matt Kelly
Graphic Dimensions, LLC
11 Burwood Lane
San Antonio, TX 78216
210-541-0707
FAX 210-541-0727
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Message: 3
Date: Sat, 08 Feb 2003 14:04:03 -0600
Subject: Re: some thoughts on CIELAB
From: "Bruce J. Lindbloom" <email@hidden>
To: ColorSync User List <email@hidden>
We should all realize that some of the "problems" being discussed in
this
"Lab bad!" discussion do not necessarily have to do with the ICC, or
even
Lab itself. The fact that colors of constant Lab hue angle do not
appear to
have the same visual hue is really not a problem. Lab was not designed
to
have this property and never claimed to have this property. Those
individuals or vendors who choose to move out-of-gamut colors along
such hue
angles are *misusing* the color space. That's not Lab's fault. Put the
blame
where it belongs. (I have been guilty of committing this sin also.)
In ICC land, Lab may be used as the PCS. PCS means "profile connection
space" which is a way of exchanging or communicating color
information. The
choice of Lab for this purpose is perfectly valid. The fact that an
Lab hue
angle does not show constant perceptual hue is irrelevant in this
context.
Vendors who make profiling software are free to map out-of-gamut colors
using whatever color spaces, sophisticated algorithms or secret sauce
they
wish. After the mapping of the color is done, simply convert to the
Lab PCS
and stick it in the ICC profile table. Profiles made this way will not
suffer the problems caused by the so-called "flaws" of Lab.
--
Bruce J. Lindbloom
email@hidden
http://www.brucelindbloom.com
--__--__--
Message: 4
From: email@hidden
Date: Sat, 8 Feb 2003 23:14:28 EST
Subject: Re: Soft Proofing Newsprint in Photoshop
To: email@hidden, email@hidden
In a message dated 2/7/03 11:18:47 PM, email@hidden writes:
The problem is the image in Photoshop is seems more washed out then
the exact print out. The black is more pale than the pale black in
the print out.
The softproof is lightening the black from monitor black, which is
already
lighter than absolute black, exagerating the weak black. I deal with
this by
adjusting the preview black when I'm building the profile, but the
software
you are using doesn't offer that option; so it would be an edit after
construction to the preview side that would be required.
C. David Tobie
Design Cooperative
email@hidden
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