Epson Stylus Color Stylus Color IIs User Manual page 108

RGB
A method of specifying color by its component proportion of red, green,
and blue. Computer monitors use this method to represent colors.
saturation
The degree to which a color is undiluted by white light. The more
saturated the color, the more pure and bright it is.
self test
A method for checking the operation of the printer. When you run the self
test, the printer prints the characters stored in its memory.
subtractive colors
Colors produced by pigments that absorb some colors of light and reflect
others.
unidirectional printing
Printing in which the print head prints in one direction only.
Unidirectional printing is useful for printing graphics because it allows
precise vertical alignment.
4
Glossary