Thanks Alpha! Another note...It's not that CMYK is a bad mode. it's that RGB is more intricate/extensive. CMYK is what Kodak, your local film processing, and professional photo labs use for color photographic negatives and prints! When I took Color Photo at school, we had to make sure...let's see if I get this term right...the 4 Toners:Cyan, Magenta, Yellow, and Black were full in the developing machine before we printed...oh, and after we'd exposed the color(CMYK) film to color(CMYK)photo paper(In the darkroom) using the CMYK gels and dials under the exposer light! So, it makes sense for Photoshop to have a CMYK color mode. It's the most accurate way proof your images, when you know you'll be going from digital to film. What Artak is trying to say is that all of the CMYK colors are included in the RGB spectrum, though the case is not so in the reverse! Thre are thousands if not millions of more colors in the RGB specrum. But it's use is limited to digital digital work, with regards to proofing(When you show a professional printer what you expect, before a job goes through a printing press. = )