Originally Posted by saberlancer
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.