Re: Replacing CMY with K in Photoshop CS3
Re: Replacing CMY with K in Photoshop CS3
- Subject: Re: Replacing CMY with K in Photoshop CS3
- From: Koch Karl <email@hidden>
- Date: Sun, 08 Jun 2008 16:22:45 +0200
The perceptual RI definitely is vendor specific, but that doesn´t mean
it has to be less accurate than relative colorimetric for the in-gamut
colors. Download basICColor print 3.0 from www.basiccolor.de and try
for yourself. The perceptual RI is close enough to relcol and can be
customized to a very wide extent. You can select a source profile for
your reference gamut and tweak the compression ratio in 100 steps
(plus reduce the optical brightener effect in 100 steps).
Going back to the original question:
Does anyone have any experience on taking a CMYK mix heavy in CMY,
and somehow converting it to a GCR mix to save on ink? For instance,
taking something like 45, 41, 35, 2 and converting it to (just an
assumption)10, 6, 0, 37 in photoshop. Is there a function that
handles this, sparing a person from doing any guess work?
To me, this looks like a spot color question, not one of separating a
complete image.
I don´t have an answer to the "in Photoshop" part of the question, but
for an external program you might want to try basICColor spoTTuner. It
does exactly what you are looking for, it lets you define your
priorities for out-of-gamut colors (do you want to retain brightness,
chroma or hue) and it lets you define your black continuously. You can
convert from Lab or RGB to CMYK in the process or from one to the
other CMYK (or stick with the same, of course). Again, download and try.
Best regards,
Karl Koch
Am 07.06.2008 um 03:29 schrieb Roger Breton:
Oh, one more thing...I have found that over the years using Relative
Colorimetric, as opposed to Perceptual Rendering intent resulted in
less
colors shifting when pulling into the smaller CMYK color gamut.
Bob
That's vendor-specific. There are no hard, fast rules when it comes to
Perceptual rendering. It's up to the profiler to interpret the PCS to
produce the "best" appearance.
Roger Breton
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