|Python Imaging Library Handbook|
The ImageColor module contains colour tables and converters from CSS3-style colour specifiers to RGB tuples. This module is used by Image.new and the ImageDraw module, among others.
The ImageColor module supports the following string formats:
Hexadecimal color specifiers, given as "#rgb" or "#rrggbb". For example, "#ff0000" specifies pure red.
RGB functions, given as "rgb(red, green, blue)" where the colour values are integers in the range 0 to 255. Alternatively, the color values can be given as three percentages (0% to 100%). For example, "rgb(255,0,0)" and "rgb(100%,0%,0%)" both specify pure red.
Hue-Saturation-Lightness (HSL) functions, given as "hsl(hue, saturation%, lightness%)" where hue is the colour given as an angle between 0 and 360 (red=0, green=120, blue=240), saturation is a value between 0% and 100% (gray=0%, full color=100%), and lightness is a value between 0% and 100% (black=0%, normal=50%, white=100%). For example, "hsl(0,100%,50%)" is pure red.
Common HTML colour names. The ImageColor module provides some 140 standard colour names, based on the colors supported by the X Window system and most web browsers. Colour names are case insensitive. For example, "red" and "Red" both specify pure red.
getrgb(color) => (red, green, blue)
(New in 1.1.4) Convert a colour string to an RGB tuple. If the string cannot be parsed, this function raises a ValueError exception.
getcolor(color, mode) => (red, green, blue) or integer
(New in 1.1.4) Same as getrgb, but converts the RGB value to a greyscale value if the mode is not color or a palette image. If the string cannot be parsed, this function raises a ValueError exception.