The colorsys module defines bidirectional conversions of color
values between colors expressed in the RGB (Red Green Blue)
color space used in computer monitors and three other coordinate
systems: YIQ, HLS (Hue Lightness Saturation) and HSV (Hue
Saturation Value). Coordinates in all of these color spaces are
floating point values. In the YIQ space, the Y coordinate is
between 0 and 1, but the I and Q coordinates can be positive or
negative. In all other spaces, the coordinates are all between 0
and 1. More information about color spaces can be found at
http://www.poynton.com/ColorFAQ.html and
http://www.cambridgeincolour.com/tutorials/color-spaces.htm. The
colorsys module defines the following functions: >>> import
colorsys >>> colorsys.rgb_to_hsv(.3, .4, .2) (0.25, 0.5, 0.4)
>>> colorsys.hsv_to_rgb(0.25, 0.5, 0.4) (0.3, 0.4, 0.2)