Some colors may be clipped or compressed as you convert from the larger gamut of RGB to the smaller gamut of CMYK. Typically, RGB has a larger range of colors (or gamut) than CMYK. The ink, the paper's brightness, and a number of press characteristics determine the actual range of color that we will be able to achieve. The conversion to the smaller CMYK space tends to impact deep blues and greens hardest. When RGB images are converted to CMYK, there is some color shift to keep the image within a range of what is printable on press. Notice the difference between offset printing's CMYK gamut compared to the gamut of a typical RGB monitor. A gamut describes the range of different Colors that can be seen or reproduced. Because of the nature of the two color spaces, not all colors in one are contained in the other. When an image is converted from RGB to CMYK, it moves between color spaces. While it seems easy, some things have to be considered. For predictable results, make color evaluations using a printed proof, not your monitor. These two color models are so different that even expensive and well-calibrated monitors will not consistently predict the color of offset printing. Reflected light from a proof or printed piece results when ambient light bounces off the paper and is filtered by transparent inks sitting on top of the paper's white background. Like a scanner, a monitor generates pixels by transmitting light using the additive primaries, red, green, and blue. Monitors use these same three colors to display images on screen. Scanners and digital cameras create images using the three primary colors of light: Red, Green and Blue an image is printed on a press, it typically uses four colors: Cyan, Magenta, Yellow and Black. Converting your color image files from RGB to CMYK is an important step in prepress preparation of digital files.

Rgb to cmyk color code