Ok you photoshop gurus, here is a slightly more complicated question, but to the right person this may be the most silly question of all time.


When we separate in CMYK - we get four channels, one for black detail and the other three subtractive colours.

In the world of ink on press, UCR or GCR is used to lower the amount of pigment (costly) of the three colours by adding grey into the mix.. Therefore the three channels
are slightly off or better stated not as clear , clean and pure as lets say Red Green and Blue from the RGB separations .. by adding the black k the printer can make of more perceived image by the addition of cheaper black ink.

How do I take off UCR or GCR ?- as I convert and then split the channels I see no way of getting rid of this unwanted noise. But this may be as easy as pie, but it alludes me.

I think Greg will have the answer but lets see..