Adobe 13102498 User Guide - Page 115

C M Y K PHOTOSHOP CS3 108 User Guide Subtractive colors (CMYK) C. Cyan M. Magenta Y. Yellow K. Black The color wheel If you're new to adjusting color components, it helps to keep a standard color wheel diagram on hand when you work on color balance. You can use the color wheel to predict how a change in one color component affects other colors and also how changes translate between RGB and CMYK color models. 0/360 R M Y 270 90 B G C 180 Color wheel R. Red Y. Yellow G. Green C. Cyan B. Blue M. Magenta For example, you can decrease the amount of any color in an image by increasing the amount of its opposite on the color wheel-and vice versa. Colors that lie opposite each other on the standard color wheel are known as complementary colors. Similarly, you can increase and decrease a color by adjusting the two adjacent colors on the wheel, or even by adjusting the two colors adjacent to its opposite. In a CMYK image, you can decrease magenta either by decreasing the amount of magenta or by increasing its complement, which is green (the color on the opposite side of the color wheel from magenta). In an RGB image, you can decrease magenta by removing red and blue or by adding green. All of these adjustments result in an overall color balance containing less magenta. See also "Choose a color with the Adobe Color Picker" on page 120 Color models, spaces, and modes A color model describes the colors we see and work with in digital images. Each color model, such as RGB, CMYK, or HSB, represents a different method (usually numeric) for describing color.