A colour separation setting that establishes the maximum percentage of black ink in a CMYK image. The setting is made before an RGB image is converted to a CMYK image.
While JPEG only supports 8 bits/channel single layer RGB images, TIFF also supports 16 bits/channel multi-layer CMYK images in PC and Macintosh format. TIFF is therefore widely used as a final format in the printing and publishing industry.
A color mode that represents the three colors (red, green, and blue) used by devices such as scanners and monitors to reproduce color. Photoshop works in RGB mode by default and even displays CMYK images by converting them to RGB.
Many layout artists have historically worked directly in CMYK (even less gamut than sRGB) space, but again, this is a device space, not a working space. If you try to print a CMYK image on a 6-color printer or show it on screen, it looks flat.
 See also: Digital camera, CMYK, Bits, Digital, RGB
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