The BNF Syntax Of CNS
T. Berk, L. Brownston, and A. Kaufman,|
A New Color-Naming System for Graphics Languages
IEEE Computer Graphics and Applications, Vol. 2, No. 3 (May, 1982), pages 37-44.
|<color name>||::=||<achromatic name> | <chromatic name>|
|<achromatic name>||::=||[<lightness>] gray | black | white|
|<chromatic name>||::=||<lightness> <saturation> <hue> | [<saturation>] [<lightness>] <hue>|
|<lightness>||::=||very dark | dark | medium | light | very light|
|<saturation>||::=||grayish | moderate | strong | vivid|
|<hue>||::=||<generic hue> | <halfway hue> | <quarterway hue>|
|<generic hue>||::=||red | orange | brown | yellow | green | blue | purple|
|<halfway hue>||::=||<generic hue> - <generic hue>|
|<quarterway hue>||::=||<ish form> <generic hue>|
|<ish form>||::=||reddish | orangish | brownish | yellowish | greenish | bluish | purplish|
The syntax of CNS is orthogonal with respect to the three terms of a color specification. All possible combinations are syntactically correct, although some syntactically correct combinations may not be realizable. For example, if a color is very light or very dark, it cannot be fully saturated. Only colors of intermediate lightness can be vivid. The maximum possible saturation of a color decreases as it becomes light or dark.
|Color Dictionaries||Go Figure!|