Re: Workflow from digital RGB photos to prepress...
Re: Workflow from digital RGB photos to prepress...
- Subject: Re: Workflow from digital RGB photos to prepress...
- From: Busher Jr Richard C <email@hidden>
- Date: Tue, 19 Apr 2005 10:57:13 -0700
Carlo,
CMYK is a device specific color space. A cmyk file that prints
beautifully on one press + paper + ink combination may not print well
on another combination, or evan at another print shop with the same
combination.
For optimum results you need a profile made for the combination you
will be working with. Usually that means a profile for the proofing
system that the printer will try to match on press. In addition, you
may actually need different profiles depending on the image content.
For example, a monochromatic image generally will print better with a
profile that calls for more black ink and a very colorful image will
often print better with a profile calling for less black ink and more
cmy. A gloss coated sheet can handle more ink than an uncoated sheet.
The maximum amount of ink allowed is included in the profile, as is the
shape of the black ink curve.
Even with the best of profiles out-of-gamut rgb colors will be
flattened with the cmyk conversion. There are many ways to minimize
this problem, and that is the 'secret sauce' that is applied to the
creation of good color separations by prepress professionals. It can
take a considerable amount of time to learn those skills needed to
'beat' the conversion engines.
My advice is to be a photographer for now, and leave the cmyk to
prepress professionals.
Cheers,
Dick Busher
Cosgrove Editions
Prepress and Print Production Services
email@hidden
888-507-7375
Message: 17
Date: Tue, 19 Apr 2005 09:52:00 +0200
From: Carlo Lavatori <email@hidden>
Subject: Workflow from digital RGB photos to prepress...
To: ColorSync <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"
So here I am all geared up and excited with my new Canon Eos 1 DS Mark
II, my new G5 dual processor, my eizo CG21, my books on camera raw and
color management.
Studied a lot and done everything just by the books, shot all my new
editorial in raw, converted it to prophoto 16 bit,
done a lot of retouching and manipulation on my calibrated Eizo, looked
carefully at all my histograms and pushed my colors to the
limits....and loved them...
but here are my worries...
If I do some quick conversions to CMYK trying different set up
everything becomes very dull of course
(I am aware of the differences between the two gamuts, etc and
therefore not surprised)...
but the point is:
what do you guys suggest or how do you manage your workflow at this
point:
trust the prepress to do a correct conversion and to reach the closest
possible gamut to my RGB image (they work in 8 bit mode)
or convert myself to CMYK into 16 bits and then color correct the
image in CMYK mode and let myself have control over this process, with
all its headaches and possibilities?
thanks
carlo
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