Re: colorsync-users digest, Vol 2 #79 - 16 msgs
Re: colorsync-users digest, Vol 2 #79 - 16 msgs
- Subject: Re: colorsync-users digest, Vol 2 #79 - 16 msgs
- From: "joe borne" <email@hidden>
- Date: Fri, 08 Dec 2000 08:23:44 -0500
Chris Allen wrote:
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I have a customer who prints his newspaper with Red, Blue and Yellow ink...
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no Black. He is purchasing an imagesetter from us and will be doing his own
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scans soon. I agreed to teach him how to scan, color correct and output film
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without loosing any of the quality of his pictures. Don't get me wrong the
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pictures aren't good but they could be worse.
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<SNIP>
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I thought I would edit the ink colors in the cmyk setup, change it to custom
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and enter the lab values I measured from the solid color bars in his paper
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and from the paper white. I then set the black generation to none, convert
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to cmyk "rby" and make color corrections based on what I see on the monitor.
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He only wants to output the seperations and then strip them into his spot
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color film. Anybody have a better idea that will display more accurately the
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final print.
Wow, this is an odd one, but I will take a shot at it. I did something
similar a few years back in the packaging arena and it worked.
First, get a copy of (gasp!) ColorBlind Pro and use it to make an extended
color profile (custom primaries) with the primaries being your RBY. Then
profile the scanner with a package like Praxisoft Scanner. Get the monitor
in shape with Optical and an X-Rite DTP-92. Set your PS5 RGB setup to Adobe
1998, scan the images, then do a convert on open from your scanner profile
to RGB setup. Once you have the images there, retouch to your liking.
Then do a profile to profile conversion with perceptual rendering intent and
the Heidelburg CMM. Go from Adobe1998 to your new RBY profile. What you see
on screen will look terrible, but once films are made and a proof pulled it
should be relatively non-sucky.
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I also noticed that the seperations he has now are all at the same angle.
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I'm guessing that this is helping his contrast because I see a lot of
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overprinting of dots that read as black. Will we need to continue this
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practice or will I benefit from a rosette? If so anybody have any ideas what
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angles would be good.
I would go to a rosette pattern and use standard newsprint rotation. (See
the GATF standard). I think your dark shadows will suffer some, but I am
sure they are very blocked up as it is. Profiling under these screen angle
conditions should let the CMM create as good a shadow and contrast as is
possible.
--
Joe Borne
Color & Graphic Technology Consultant
(859) 282-0393
-- "The opinions expressed by this individual do not necessarily reflect the
actual opinions of this individual. Unless you agree with these opinions, in
which case I will feel free to spread the blame around when people get mad
at me." --