Re: Dot gain in PS 6
Re: Dot gain in PS 6
- Subject: Re: Dot gain in PS 6
- From: Jim Rich <email@hidden>
- Date: Thu, 22 Nov 2001 06:27:01 -0500
On 11/21/01 2:13 PM, "Larry Wilson" <email@hidden> wrote:
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Recently there was some discussion on this list concerning dot gain
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settings in Photoshop and the fact that by default the cyan dot gain
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was 4 points higher than the other channels, in contradiction to
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typical offset dot gain conditions. It was noted that Dan Margulis
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wrote that this was a kludge to fix Photoshop's separation algorithm,
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which separated images with too much cyan in them.
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My question for this list, and especially anyone from Adobe lurking
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around, is this still true for PS 6's separation algorithm? If I am
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measuring dot gain with a densitometer of an actual press run to get
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proper dot gain information, do I need to add 4 points onto my cyan
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to avoid getting images that are too blue? One post seemed to
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indicate this.
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Any comments?
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Larry,
I don9t know your printing conditions ( web or sheet fed) but the PS6 color
engine is based on using icc profiles and uses dot gain information based
on how each of profile was created for a printing condition. I believe the
dot gain values are described in the Blatner/Fraser/ RealWorld Photoshop
book ,but I don9t think they ( the dot gain values for PS6 profiles) are
defined to an exact specification anywhere. As for the gray balance in the
default PS 6 profiles and their relationship to traditional printing it is
close to text book gray balances that create the appearance of neutral gray
that traditional pre-press and printing businsesses might expect.
I am not really sure what you are looking for, but if you want a seat of the
pants solution to fix gray balance and dot gain in PS 6, IHMO you don9t need
one with the supplied PS6 profiles, unless you have pre-press and printing
process with unusual characteristics that falls outside of the traditional
proofing and printing process.
Jim Rich