[alt-photo] Re: Tricolor printing/Photoshop

[Dave S (fotodave)]

If it is for illustration purpose only, you could take an RGB image, convert
it CMYK. Then if you want to illustrate C and M combination, just delete or
hide the Y and K channels. Same for other combinations. The colors shown
would be a little too good to be true, however.

If you want it to be more accurate, you can create a blank CMYK image of the
same size as the image you want to illustrate. Then for the C channel (or
layer, I forgot what terminology Photoshop uses), copy the Red channel of
the original image but *invert* it. Same for other channel and leave the K
channel empty. This is assuming your use straight inversion of RGB to CMY
(the method that the late Katherine prefers).


Dave


-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Marek Matusz
Sent: Saturday, May 26, 2012 6:30 PM
To: alt photo
Subject: [alt-photo] Tricolor printing/Photoshop



 All, I am having a mental block. I know somebody posted it before, but I
just can't come up with it. I would like to display on the screen a
'simulation' of RGB gum printing. That is to take for example R channel and
colour it cyan, then take G channel colour it magenta and combine with the
previous layer to display effect of the two layers printed together, etc.
Marek  		 	   		  
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