55 lines
1.7 KiB
TeX
55 lines
1.7 KiB
TeX
|
\section{\module{colorsys} ---
|
||
|
|
Conversions between color systems}
|
||
|
|
|
||
|
|
\declaremodule{standard}{colorsys}
|
||
|
|
\modulesynopsis{Conversion functions between RGB and other color systems.}
|
||
|
|
\sectionauthor{David Ascher}{da@python.net}
|
||
|
|
|
||
|
|
The \module{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
|
||
|
|
\url{http://www.inforamp.net/\%7epoynton/ColorFAQ.html}.
|
||
|
|
|
||
|
|
The \module{colorsys} module defines the following functions:
|
||
|
|
|
||
|
|
\begin{funcdesc}{rgb_to_yiq}{r, g, b}
|
||
|
|
Convert the color from RGB coordinates to YIQ coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
\begin{funcdesc}{yiq_to_rgb}{y, i, q}
|
||
|
|
Convert the color from YIQ coordinates to RGB coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
\begin{funcdesc}{rgb_to_hls}{r, g, b}
|
||
|
|
Convert the color from RGB coordinates to HLS coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
\begin{funcdesc}{hls_to_rgb}{h, l, s}
|
||
|
|
Convert the color from HLS coordinates to RGB coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
\begin{funcdesc}{rgb_to_hsv}{r, g, b}
|
||
|
|
Convert the color from RGB coordinates to HSV coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
\begin{funcdesc}{hsv_to_rgb}{h, s, v}
|
||
|
|
Convert the color from HSV coordinates to RGB coordinates.
|
||
|
|
\end{funcdesc}
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
\begin{verbatim}
|
||
|
|
>>> 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)
|
||
|
|
\end{verbatim}
|