Re: UCR/GCR
Re: UCR/GCR
- Subject: Re: UCR/GCR
- From: Phil Cruse <email@hidden>
- Date: Sun, 8 Jun 2008 09:58:39 +0100
- Authenticated-sender:
Hi Marco and others,
The definition of UCR that I have is that it *mainly* replaces
neutral tones
in the shadow areas. I know, "mainly" is a bit of a weasel word,
isn't it?
Anyway, I'm not sure that UCR extends to midtones or highlights.
Can anyone share more info on this?
370% seems too high. What kind of printing process is this?
I have no idea, but I would sure like to see the results...including
the
soaked sheet and dripping ink! :-)
Take care.
Marco
That's pretty much it. Under Colour Removal was even around back in
the days of Camera separations (using photographic masking)! I can
just about remember it being touted, of course I was very young then!
It was much easier on scanners of course. It's principal function was
to control the amount of TAC, especially on web presses. Hence it
usually started in the upper midtones and went up to the max, but as
far as possible kept to the neutrals. CMY being partly replaced by
Black, which was also cheaper. In Crosfield and other companies,
before GCR was properly developed, it was often called "extended UCR".
In Germany it was "Unbunt Aufbau" I believe. GCR can of course replace
the tertiary colour in more saturated regions with black. These days
think of UCR as being "Reduced GCR" in modern profiling apps. Because
GCR can work throughout the range, it can help achieve neutral Grey
Balance on presses and inkjets, as well as saving ink and achieving
the the correct TAC.
The quoted figure of 370% suggests a lack of understanding of printing
technology. More doesn't always mean darker! After a certain TAC the
DMax or L* may start getting lighter!
Cheers
Phil Cruse
Graphic Quality Consultancy
http://www.colourphil.co.uk
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