Re: grayscale settings for offset printing
Re: grayscale settings for offset printing
- Subject: Re: grayscale settings for offset printing
- From: Ernst Dinkla <email@hidden>
- Date: Fri, 16 Dec 2005 12:31:30 +0100
The original message was:
Greetings: I'm seeking info on correctly converting to
> grayscale specifically for offset printing. I'm very
> comfortable doing the actual conversion utilizing
> Photoshop's Channel Mixer, but its the specific settings
> I'm hoping to understand. I've had great success with
> RGB-CMYK conversions, using the specific CMYK - ICC
> profile from the printer/separator, but am less clear
> about grayscale. Obviously I can setup my system to
> convert to grayscale with a 15% dot gain, or whatever
> the printer tells me, but is that it? If they'll give me their
> dot gain settings for the quarter tones, half tones and
> three quarter tones (for the paper/ink combo in question)
> is there a way to build a better conversion?
> I haven't seen much written on this, since everything
> seems aimed at inkjet. The two-dozen "originals" are
> arriving digitally from many different sources, some
> untagged, some in various flavors of grayscale already,
> and many in RGB. I'd like to set up a good workflow for
> these. Thanks for anyone's insights.
Chris Bain
On the Channel mixer, that works and you will find several
mixes mentioned if you google for B&W conversions:
One example:
http://www.photo.net/equipment/digital/editing/bwconvert/
It may be easier and possibly better if you buy one of the B&W
conversions plug-ins that simulate the spectral sensitivities
of the common B&W films. If the grayscale images you already
have reveal the characteristics of the films used then you can
adapt the conversions to the other rescales images.
www.theimagingfactory.com,
www.silveroxide.com,
http://www.powerretouche.com/Black-white_plugin_introduction.htm.
I still think that the Quadtone Rip approach is worth
studying. If the offset printer is cooperating this can't be
a difficult task. Assign or convert to Gamma 2.2 or use QTR's
rescales space. Edit were necessary in PS and convert in PS to
the printer profile you made with the QTR profile maker. The
printer only needs to keep the rest linearised.
Ernst
--
Ernst Dinkla
www.pigment-print.com
( unvollendet )
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