RGB definition

RGB stands for red, green and blue.  It is a color system frequently used in digital printing.  This is a color system that may not be used for planographic printing (like lithography).  During the printing process, light magenta, light cyan, an additional black and often green and orange are added as well in order to lend a broader color range and an enhanced tonal gradation.  Light is made up of the primary colors of RGB – they are not the same as the primary colors of the pigments in inks and paint.