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55 lines
1.7 KiB
TeX
55 lines
1.7 KiB
TeX
\section{\module{colorsys} ---
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Conversions between color systems}
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\declaremodule{standard}{colorsys}
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\modulesynopsis{Conversion functions between RGB and other color systems.}
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\sectionauthor{David Ascher}{da@python.net}
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The \module{colorsys} module defines bidirectional conversions of
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color values between colors expressed in the RGB (Red Green Blue)
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color space used in computer monitors and three other coordinate
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systems: YIQ, HLS (Hue Lightness Saturation) and HSV (Hue Saturation
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Value). Coordinates in all of these color spaces are floating point
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values. In the YIQ space, the Y coordinate is between 0 and 1, but
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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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More information about color spaces can be found at
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\url{http://www.inforamp.net/\%7epoynton/ColorFAQ.html}.
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The \module{colorsys} module defines the following functions:
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\begin{funcdesc}{rgb_to_yiq}{r, g, b}
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Convert the color from RGB coordinates to YIQ coordinates.
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\end{funcdesc}
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\begin{funcdesc}{yiq_to_rgb}{y, i, q}
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Convert the color from YIQ coordinates to RGB coordinates.
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\end{funcdesc}
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\begin{funcdesc}{rgb_to_hls}{r, g, b}
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Convert the color from RGB coordinates to HLS coordinates.
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\end{funcdesc}
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\begin{funcdesc}{hls_to_rgb}{h, l, s}
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Convert the color from HLS coordinates to RGB coordinates.
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\end{funcdesc}
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\begin{funcdesc}{rgb_to_hsv}{r, g, b}
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Convert the color from RGB coordinates to HSV coordinates.
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\end{funcdesc}
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\begin{funcdesc}{hsv_to_rgb}{h, s, v}
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Convert the color from HSV coordinates to RGB coordinates.
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\end{funcdesc}
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Example:
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\begin{verbatim}
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>>> import colorsys
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>>> colorsys.rgb_to_hsv(.3, .4, .2)
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(0.25, 0.5, 0.4)
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>>> colorsys.hsv_to_rgb(0.25, 0.5, 0.4)
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(0.3, 0.4, 0.2)
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\end{verbatim}
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