Adobe ACROBAT 3D Manual page 710

About color models
No device in a publishing system is capable of reproducing the full range of colors
viewable by the human eye. Each device operates within a specific color space, which can
produce a certain range, or gamut, of colors.
The RGB (red, green, blue) and CMYK (cyan, magenta, yellow, and black) color models
represent two main categories of color spaces. The gamuts of the RGB and CMYK spaces
are very different. While the RGB gamut is generally larger (that is, capable of
representing more colors) than CMYK, some CMYK colors fall outside of the RGB
gamut.
The extent of the RGB color gamut exceeds that of the CMYK color gamut. A. RGB color gamut
B. CMYK color gamut
In addition, different devices produce slightly different gamuts within the same color
model. For example, a variety of RGB color spaces can exist among scanners and
monitors, and a variety of CMYK color spaces can exist among printing presses and
desktop printers.
Related Subtopics:
RGB model
CMYK model
Grayscale model