3 Replies Latest reply: Nov 6, 2011 12:49 PM by Simon Gregory RSS

    'greyscale' RGB image, need to convert to specific CMYK black...  how?

    Simon Gregory Community Member

      Hi,

       

      I have an image provided in RGB, but visually it's greyscale, except for some red areas on certain clothing. I need to convert it to CMYK, and I want all the black areas to be 40/30/20/100, and the grey values should be percentages of this mix. The red should be visually unaltered. Im using CS3 btw.

       

      Is there a way to quickly do this? I can convert to a generic CMYK value then tweak the curves of each channel, but it will affect the red. I could make a selection to exclude the red, but i feel there must be a way for me to define my black, and convert, and for my wishes to be granted automagically.

       

      I tried redefining my default black in the foreground/background swatches, but that had no effect on the subsequent conversion.

       

      Also, I'm trying to avoid profiles as my brain is foggy in that area...

       

      Thank you,

       

      Simon Gregory