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# 21.7. `colorsys` — Conversions between color systems

Source code: Lib/colorsys.py

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.

See also

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:

`colorsys.``rgb_to_yiq`(r, g, b)

  Convert the color from RGB coordinates to YIQ coordinates.

`colorsys.``yiq_to_rgb`(y, i, q)

  Convert the color from YIQ coordinates to RGB coordinates.

`colorsys.``rgb_to_hls`(r, g, b)

  Convert the color from RGB coordinates to HLS coordinates.

`colorsys.``hls_to_rgb`(h, l, s)

  Convert the color from HLS coordinates to RGB coordinates.

`colorsys.``rgb_to_hsv`(r, g, b)

  Convert the color from RGB coordinates to HSV coordinates.

`colorsys.``hsv_to_rgb`(h, s, v)

  Convert the color from HSV coordinates to RGB coordinates.

Example:

    >>> import colorsys
    >>> colorsys.rgb_to_hsv(0.2, 0.4, 0.4)
    (0.5, 0.5, 0.4)
    >>> colorsys.hsv_to_rgb(0.5, 0.5, 0.4)
    (0.2, 0.4, 0.4)

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