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66 lines
1.8 KiB
ReStructuredText
:mod:`colorsys` --- Conversions between color systems
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=====================================================
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.. module:: colorsys
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:synopsis: Conversion functions between RGB and other color systems.
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.. sectionauthor:: David Ascher <da@python.net>
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**Source code:** :source:`Lib/colorsys.py`
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--------------
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The :mod:`colorsys` module defines bidirectional conversions of color values
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between colors expressed in the RGB (Red Green Blue) color space used in
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computer monitors and three other coordinate systems: YIQ, HLS (Hue Lightness
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Saturation) and HSV (Hue Saturation Value). Coordinates in all of these color
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spaces are floating point values. In the YIQ space, the Y coordinate is between
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0 and 1, but the I and Q coordinates can be positive or negative. In all other
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spaces, the coordinates are all between 0 and 1.
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.. seealso::
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More information about color spaces can be found at
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https://poynton.ca/ColorFAQ.html and
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https://www.cambridgeincolour.com/tutorials/color-spaces.htm.
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The :mod:`colorsys` module defines the following functions:
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.. function:: rgb_to_yiq(r, g, b)
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Convert the color from RGB coordinates to YIQ coordinates.
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.. function:: yiq_to_rgb(y, i, q)
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Convert the color from YIQ coordinates to RGB coordinates.
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.. function:: rgb_to_hls(r, g, b)
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Convert the color from RGB coordinates to HLS coordinates.
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.. function:: hls_to_rgb(h, l, s)
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Convert the color from HLS coordinates to RGB coordinates.
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.. function:: rgb_to_hsv(r, g, b)
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Convert the color from RGB coordinates to HSV coordinates.
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.. function:: hsv_to_rgb(h, s, v)
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Convert the color from HSV coordinates to RGB coordinates.
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Example::
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>>> import colorsys
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>>> colorsys.rgb_to_hsv(0.2, 0.4, 0.4)
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(0.5, 0.5, 0.4)
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>>> colorsys.hsv_to_rgb(0.5, 0.5, 0.4)
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(0.2, 0.4, 0.4)
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