Once the photo has been toned in RGB then converted to CMYK, you can then bump up the contrast if needed (especially for newsprint.) I do this by selecting what I want to be the darkest black and raising those values as high as I can in the black channel. In the same area, go to the cyan channel and raise the values up a bit as well. You will have to watch the midtones and remove cyan in them as it will increase as you add it to the shadows. Also keep and eye out on the black as well in the midton areas.
Bumping values after CMYK??? You must be kidding! Until the day that there is a Total Ink Warning in Photoshop this is the most common reason why we get too high ink. 25 years ago people didn't know better. IMO the ONLY thing that should ever be needed to do with an image in CMYK is possibly sharpening, otherwise there is either something wrong with your workflow or your separation profile.
Agree 100%Bumping values after CMYK??? You must be kidding! Until the day that there is a Total Ink Warning in Photoshop this is the most common reason why we get too high ink. 25 years ago people didn't know better.
IMO the ONLY thing that should ever be needed to do with an image in CMYK is possibly sharpening, otherwise there is either something wrong with your workflow or your separation profile.
I find an adjustment layer set to Luminosity mode is just as good, and without the extra conversion steps (and the associated quantization).If you want to adjust contrast, without affecting color, in RGB - convert the RGB to Lab mode and adjust the contrast curve of the L channel. Once you're happy, convert back to RGB.
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