This principle is called color subtraction (your printer uses CMYK pigments and color substitution to make the pictures you print). Printed materials, like the acetates in this activity, use CMYK's ability to absorb or filter RGB colors to produce a multitude of other colors. If white light interacts with the primary colors of pigments, primary colors of light are removed. The secondary colors of light are the primary colors of pigments or dyes (not red, yellow, and blue, as many people are taught).
( K is also used to avoid confusion with blue.) You might see the initials of these colors, CMYK, in association with various printing procedures, processes, and products. In printing, the abbreviation for black is K- K stands for key or key color. In printing, the abbreviation for cyan is C, magenta is M, and yellow is Y.īlack is usually used in conjunction with cyan, magenta, and yellow to provide image details (click to enlarge diagram below). The secondary colors of light are cyan, magenta, and yellow. The combinations of two of the three primary colors of light produce the secondary colors of light. Red, green, and blue are known as the primary colors of light. Since human brains only process those three colors of light, white light can effectively be described as a combination of RGB. Your brain takes the stimuli from those three colors and interprets all the other colors based on the proportion of R to G to B. Although white light contains a rainbow of colors, our eyes are only sensitive to red ( R), green ( G), and blue ( B) light.
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