RGB is a way of describing color. Each color is described by a set of three numbers. For example, (102, 51, 255) describes THIS COLOR.
These numbers are called the color's RGB value. The letters RGB stand for Red, Green and Blue. Red, green and blue are known as "primary additive colors". All other colors are some combination of these three primary colors. For example, yellow = red + green.
The RGB value, written (nnn, nnn, nnn), describes the BRIGHTNESS of the red, green, and blue components that make up that color. The values are always written in red, green, blue order. Each value can range from 0 to 255. Thus the RGB notation can range from (0, 0, 0) to (255, 255, 255) and every combination in between. The RGB color system can describe 256 x 256 x 256 or 16777216 different colors.
This is the color chart. It will be our guide to black and white conversion. The color chart will show us how a conversion method affects different colors. The color chart has six colors: red, green, blue, cyan, magenta, yellow. It also has a grayscale bar.
On the color chart each colored box shows its RGB value. For example, the RED box has an RGB value of 255, 0, 0.
The other colors on the chart are cyan, magenta, and yellow. Expand the chart to see the relationship between the primary colors and the secondary colors. For example CYAN (0, 255, 255) has the opposite values of RED (255, 0, 0); MAGENTA (255, 0, 255) has the opposite values of GREEN (0, 255, 0); and YELLOW (255, 255, 0) has the opposite values of BLUE (0, 0, 255). You can think of the secondary colors as the primary colors' complement or anti-color.