Re: Colorsync-users Digest, Vol 6, Issue 81
Re: Colorsync-users Digest, Vol 6, Issue 81
- Subject: Re: Colorsync-users Digest, Vol 6, Issue 81
- From: Niraj Agarwal <email@hidden>
- Date: Wed, 15 Apr 2009 15:30:15 -0400
Devin,
This is the email list for colorsync users. Could be a another place
to post if the job description is primarily technical.
Niraj
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Date: Wed, Apr 15, 2009 at 3:03 PM
Subject: Colorsync-users Digest, Vol 6, Issue 81
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Today's Topics:
1. Cori Devlin/AE/DuPont is out of the office. (Cori Devlin)
2. Re: Proofing Papers for Color Laser Printers (Joseph Yates)
3. RE: Proofing Papers for Color Laser Printers (Roger)
4. Re: Proofing Papers for Color Laser Printers (Klaus Karcher)
5. RE: Proofing Papers for Color Laser Printers (Roger)
6. proofing to match sheetfed uncoated (Mike Stewart)
7. Re: proofing to match sheetfed uncoated (Louis Dery)
----------------------------------------------------------------------
Message: 1
Date: Tue, 14 Apr 2009 16:01:02 -0400
From: Cori Devlin <email@hidden>
Subject: Cori Devlin/AE/DuPont is out of the office.
To: colorsync-users <email@hidden>
Message-ID:
<email@hidden>
Content-Type: text/plain; charset="us-ascii"
I will be out of the office starting 04/13/2009 and will not return until
04/20/2009.
I will be out of the office 4/13/09 returning on 4/20/09. I will have no
access to email.
Kind Regards,
Cori Devlin
Cori
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------------------------------
Message: 2
Date: Tue, 14 Apr 2009 15:38:25 -1000
From: Joseph Yates <email@hidden>
Subject: Re: Proofing Papers for Color Laser Printers
To: ColorSync Users Mailing List <email@hidden>
Message-ID: <C60A5E71.378FF%email@hidden>
Content-Type: text/plain; charset="ISO-8859-1"
on 4/13/09 4:32 PM, Joseph Yates wrote:
> Would finding a laser paper (such as HPąs Presentation Laser Paper) with a
> Brightness rating of 95% be the same (or similar) to a ISO Coated #1 paper?
After some researching I believe that looking at a paper's CIE "Whiteness"
might be a better way to find a paper that is a closer match to the
ISOcoated v2 paper Lab value of 95,0,-2.
>From International Paper site:
> " company is also transitioning the way it describes its products from the old
> GE brightness standard to the CIE whiteness scale.
>
> "At International Paper we are initiating this improvement for our customers
> because we believe whiteness is the best descriptor of the appearance of
> paper,"
So now I've found some laser papers that list their CIE WHITENESS - but how
does one translate that value to CIE Lab?
If I know a paper's CIE Whiteness rating (for example HP's Brochure Laser
Paper HEW-Q6610A - CIE Whiteness = 100) - how can I know if that is close to
the ISOcoated v2 paper target?
Regards
Joseph Yates | Pacifica Island Art | Maui, Hawaii
------------------------------
Message: 3
Date: Tue, 14 Apr 2009 21:56:01 -0400
From: Roger <email@hidden>
Subject: RE: Proofing Papers for Color Laser Printers
To: 'Joseph Yates' <email@hidden>
Cc: email@hidden
Message-ID: <009001c9bd6d$53dc9620$fb95c260$@ca>
Content-Type: text/plain; charset=iso-8859-1
Unfortunately, as far as I know, there are no direct translation or
conversion between ISO Whiteness and CIE Lab.
It might help to know that NONE of the laser paper I tested ever come close
to real presses printing paper -- NONE. They always incorporate a surdose of
optical brighteners which makes glow badly under a UV lamp and makes them
score above 100 on the CIE Whiteness scale, but are nowhere near a paper
like Lustro Gloss 95, 0, -2. The best method, in my view, is to compare them
visually. Also, keep in mind that, it's not because you find a laser paper
that is visually close (Mohawk Navajo Digital is the least worst IMO) to ISO
Coated, that it will necessarily reproduce colors LIKE an ISO Coated paper.
Best / Roger
> > Would finding a laser paper (such as HPąs Presentation Laser Paper)
> with a
> > Brightness rating of 95% be the same (or similar) to a ISO Coated #1
> paper?
>
> After some researching I believe that looking at a paper's CIE
> "Whiteness"
> might be a better way to find a paper that is a closer match to the
> ISOcoated v2 paper Lab value of 95,0,-2.
>
> >From International Paper site:
> > " company is also transitioning the way it describes its products
> from the old
> > GE brightness standard to the CIE whiteness scale.
> >
> > "At International Paper we are initiating this improvement for our
> customers
> > because we believe whiteness is the best descriptor of the appearance
> of
> > paper,"
>
> So now I've found some laser papers that list their CIE WHITENESS - but
> how
> does one translate that value to CIE Lab?
>
> If I know a paper's CIE Whiteness rating (for example HP's Brochure
> Laser
> Paper HEW-Q6610A - CIE Whiteness = 100) - how can I know if that is
> close to
> the ISOcoated v2 paper target?
>
> Regards
>
> Joseph Yates | Pacifica Island Art | Maui, Hawaii
>
>
>
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------------------------------
Message: 4
Date: Wed, 15 Apr 2009 14:52:00 +0200
From: Klaus Karcher <email@hidden>
Subject: Re: Proofing Papers for Color Laser Printers
To: Joseph Yates <email@hidden>
Cc: colorsync-users <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Joseph Yates wrote:
> So now I've found some laser papers that list their CIE WHITENESS - but how
> does one translate that value to CIE Lab?
Not at all unfortunately.
> If I know a paper's CIE Whiteness rating (for example HP's Brochure Laser
> Paper HEW-Q6610A - CIE Whiteness = 100) - how can I know if that is close to
> the ISOcoated v2 paper target?
For details about whiteness assessment see
<http://mitglied.lycos.de/whiteness/WhitenessFormulas.pdf>
... there is a good deal of further valuable information on whiteness,
optical brighteners etc. on Claudio Puebla's website:
<http://mitglied.lycos.de/whiteness/>
Klaus
------------------------------
Message: 5
Date: Wed, 15 Apr 2009 09:24:45 -0400
From: Roger <email@hidden>
Subject: RE: Proofing Papers for Color Laser Printers
To: 'Klaus Karcher' <email@hidden>
Cc: 'colorsync-users' <email@hidden>
Message-ID: <00a401c9bdcd$8adf38c0$a09daa40$@ca>
Content-Type: text/plain; charset=iso-8859-1
Sehr shoën references, danke shoën Klaus :-)
Roger
>
> For details about whiteness assessment see
> <http://mitglied.lycos.de/whiteness/WhitenessFormulas.pdf>
>
> ... there is a good deal of further valuable information on whiteness,
> optical brighteners etc. on Claudio Puebla's website:
> <http://mitglied.lycos.de/whiteness/>
>
> Klaus
------------------------------
Message: 6
Date: Wed, 15 Apr 2009 13:08:01 -0500
From: "Mike Stewart" <email@hidden>
Subject: proofing to match sheetfed uncoated
To: email@hidden
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Lately I have been working on an Indigo 5000; trying to make it a reliable
proofing machine. So far so good; especially when proofing to GRACoL
specs. It should be mentioned that we are also using a Creo Production
Flow RIP. Now that I have my sheetfed coated process where I want it; I'm
now looking to match an uncoated sheetfed press sheet. If I use the US
Sheetfed Uncoated profile and my Indigo profile I find that the resulting
proof is very muddy, dirty, etc. etc. Looking at the US Sheetfed Uncoated
profile I see that the CMYK colorants are somewhat muddy - is that where
my issue is? Maybe I need to create a profile that is not so muddy in the
first place. I know from doing press checks that an uncoated sheet will
print with dot gains ranging about 3 - 5 percent higher than a coated
sheet; but I really cannot see the inks being as contaminated as they
appear in the canned US Sheetfed Uncoated profile. I do, however, want to
stay within "Industry Standards". Any help would be appreciated. Mike
Stewart
------------------------------
Message: 7
Date: Wed, 15 Apr 2009 14:46:00 -0400
From: Louis Dery <email@hidden>
Subject: Re: proofing to match sheetfed uncoated
To: ColorSync List <email@hidden>
Cc: Mike Stewart <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Hello Mike,
About your workflow, do you repurpose (CMTK to CMYK) job for Uncoated
stock OR you simply apply a curve for uncoated dot gain you have?
Just want to understand what you mean about "contaminated inks" as
they appear in the canned US Sheetfed Uncoated profile.
A profile made with a good GCR and lower ink coverage would help for
a custom uncoated stock profile.
Take a look at the following link that may be of interest for you:
http://www.environmentalbychoice.com/papers_colour-profile.php
Louis Dery
On Apr 15, 2009, at 2:08 PM, Mike Stewart wrote:
> Lately I have been working on an Indigo 5000; trying to make it a
> reliable
> proofing machine. So far so good; especially when proofing to GRACoL
> specs. It should be mentioned that we are also using a Creo Production
> Flow RIP. Now that I have my sheetfed coated process where I want
> it; I'm
> now looking to match an uncoated sheetfed press sheet. If I use the US
> Sheetfed Uncoated profile and my Indigo profile I find that the
> resulting
> proof is very muddy, dirty, etc. etc. Looking at the US Sheetfed
> Uncoated
> profile I see that the CMYK colorants are somewhat muddy - is that
> where
> my issue is? Maybe I need to create a profile that is not so muddy
> in the
> first place. I know from doing press checks that an uncoated sheet
> will
> print with dot gains ranging about 3 - 5 percent higher than a coated
> sheet; but I really cannot see the inks being as contaminated as they
> appear in the canned US Sheetfed Uncoated profile. I do, however,
> want to
> stay within "Industry Standards". Any help would be appreciated. Mike
> Stewart
>
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Best,
Niraj Agarwal
603-275-9083 (cell)
603-434-6038 (home)
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