Color Models RGB Color Model CMY Color Model

Color Models • RGB Color Model • CMY Color Model • HSV(HSB) Color Model 1

RGB Color Model v Additive in nature : Color mixing begins with black and ends with white as more color is added. v Used in screens ( T V , Monitors , Mobiles ) – – – – R = (1, 0, 0) G = (0, 1, 0) B = (0, 0, 1) R + G = (1, 0, 0) + (0, 1, 0) = (1, 1, 0) = Y R + B = (1, 0, 0) + (0, 0, 1) = (1, 0, 1) = M B + G = (0, 0, 1) + (0, 1, 0) = (0, 1, 1) = C R + G + B = (1, 1, 1) = W

RGB Color Model

CMY Color Model v Subtractive in nature : Color mixing means that one begins with white and ends with black; as one adds color, the result gets darker and tends to black. v Used in printers

Conversion • Conversion from RGB to CMY • Conversion from CMY to RGB 6

HSV Color Model • Anyone with a monitor has probably heard of the RGB color space. • If you deal with printers, you know about CMYK • HSV (HSB) is used in your graphics software. • Hue is expressed as a number from 0 to 360 degrees • Saturation is how pure (vs. dull) the color is, ranging from 0 to 100, where 100 is fully saturated • Value or brightness describes the intensity of the color from zero percent to 100 percent. 7

• If Saturation =0 , Value =100 then color displayed is White. • If Brightness is 0 then color displayed in Black