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CMYK channel mixer problems..

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Old 01-26-2007, 02:39 PM
CJ Swartz's Avatar
CJ Swartz CJ Swartz is offline
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Re: CMYK channel mixer problems..

Originally Posted by saberlancer
Thks Murray,
Well thats one alternative I've been using..
Just wondering if there's a way to retain the channel mixer layer and just show/hide.

Any reason why it works so much better in RGB than CMYK?
I mean the channel mixer method to adjust/convert to B/w.
Saber, what percentages are you using in CMYK? I decided to play around with some samples, and if you keep the total percentages of the FOUR channels at 100% (as we're encouraged to do in RGB) then I think it is more likely to look washed out -- but if we think "I've got 4 channels instead of 3 to work with, I should be able to play around with higher percentages" and add another 25% to the total you can play around with -- I think you'll have more contrast.

You can also copy each of the CMYK channels as separate layers into a new CMYK document, and then use blending modes, opacity settings, and even layer masks to give you a LOT of options in creating the B/W look you want.

And then you start working with duotones, tritones, quadtones as Ant mentioned, and there are even more lovely options for end results.
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Old 01-27-2007, 01:03 AM
Craig Walters's Avatar
Craig Walters Craig Walters is offline
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Re: CMYK channel mixer problems..

i'm surprised you would get a red tint by desaturating with hue/sat. that just seems odd. nonetheless, if that's what you're getting then that's what you're getting.

try Fotomatic's 'Fast Fix' plugin. this is one i've used a lot to desaturate quickly.
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