Red, green, and blue (RGB) are the primary colors of light. Cyan, magenta, yellow and black (CMYK) are the primary colors of printing. RGB color is used to display on your computer screen. RGB is called additive color. The more light you add the lighter your color becomes. When equal amounts of the RGB primary colors are at their highest level, the resulting color is white. CMYK color is used for printing. Dots of ink are printed on paper for each color: cyan, magenta, yellow

Color pointers from Leatrice Eiseman's Guide to Communicating with Color : When two variations of the same color, one light and one dark, are printed next to each other, the lighter shade will seem lighter, and the darker shade will appear to be darker. Large color areas influence smaller color masses. If a small square of medium gray is surrounded by a larger area in black, the gray square will appear brighter than the same square surrounded by white. The human mind connects