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<title>14.7 colorsys -- Conversions between color systems
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<H1><A NAME=
"SECTION0016700000000000000000">
14.7 <tt class=
"module">colorsys
</tt> --
Conversions between color systems
</A>
<A NAME=
"module-colorsys"></A>
The
<tt class=
"module">colorsys
</tt> 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
<a class=
"url" href=
"http://www.poynton.com/ColorFAQ.html">http://www.poynton.com/ColorFAQ.html
</a>.
The
<tt class=
"module">colorsys
</tt> module defines the following functions:
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4749' xml:id='l2h-
4749'
class=
"function">rgb_to_yiq
</tt></b>(
</nobr></td>
<td><var>r, g, b
</var>)
</td></tr></table></dt>
Convert the color from RGB coordinates to YIQ coordinates.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4750' xml:id='l2h-
4750'
class=
"function">yiq_to_rgb
</tt></b>(
</nobr></td>
<td><var>y, i, q
</var>)
</td></tr></table></dt>
Convert the color from YIQ coordinates to RGB coordinates.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4751' xml:id='l2h-
4751'
class=
"function">rgb_to_hls
</tt></b>(
</nobr></td>
<td><var>r, g, b
</var>)
</td></tr></table></dt>
Convert the color from RGB coordinates to HLS coordinates.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4752' xml:id='l2h-
4752'
class=
"function">hls_to_rgb
</tt></b>(
</nobr></td>
<td><var>h, l, s
</var>)
</td></tr></table></dt>
Convert the color from HLS coordinates to RGB coordinates.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4753' xml:id='l2h-
4753'
class=
"function">rgb_to_hsv
</tt></b>(
</nobr></td>
<td><var>r, g, b
</var>)
</td></tr></table></dt>
Convert the color from RGB coordinates to HSV coordinates.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
4754' xml:id='l2h-
4754'
class=
"function">hsv_to_rgb
</tt></b>(
</nobr></td>
<td><var>h, s, v
</var>)
</td></tr></table></dt>
Convert the color from HSV coordinates to RGB coordinates.
<div class=
"verbatim"><pre>
>>> import colorsys
>>> colorsys.rgb_to_hsv(
.3,
.4,
.2)
>>> colorsys.hsv_to_rgb(
0.25,
0.5,
0.4)
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<span class=
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2005.
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