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: Mike Strickler <email@hidden>
- Date: Wed, 15 Apr 2009 13:45:28 -0700
Mike,
First, an accurate proof for uncoated SHOULD look muddy, just like
the real thing. Whether your particular proofs are muddier than they
should be is impossible to answer from here; you need to measure, and
not just solids. Print out a profiling chart through this workflow,
measure it, and compare the data to the reference set.
Second, please, everybody: The Indigo is a wonderful machine, but it
is NOT a good choice for a proofer. Making it behave "like" offset is
one thing (and not that simple in itself, if one considers
overprints), but for proofing it does not have anything close to
required stability, even though for a press it's pretty good if one
does frequent LUT generations. If you want to make proofs for offset
you need a dedicated proofer, not a digital press, and some means of
verifying the accuracy of the match to the reference. Anything less
is simply not a proof. I know, HP and a RIP vendor have certified an
Indigo "proofer" through IDEAlliance; unfortunately the certification
process does not currently measure stability.
Mike Strickler
IDEAlliance G7 Expert
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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
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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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