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r879@spiff: Fredrik | 2005-11-12 14:38:03 +0100

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r878@spiff:  Fredrik | 2005-11-12 14:37:22 +0100
  minor docstring and comment tweaks (wikipedia might not be the
  ultimate reference, but it's a lot better than "XXX" ;-)
This commit is contained in:
Fredrik Lundh 2005-11-12 15:21:05 +00:00
parent 3a49e92d7d
commit 0d89e351e1
1 changed files with 14 additions and 11 deletions
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25
Lib/colorsys.py
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@ -5,17 +5,21 @@ This modules provides two functions for each color system ABC:
rgb_to_abc(r, g, b) --> a, b, c
abc_to_rgb(a, b, c) --> r, g, b
All inputs and outputs are triples of floats in the range [0.0...1.0].
Inputs outside this range may cause exceptions or invalid outputs.
All inputs and outputs are triples of floats in the range [0.0...1.0]
(with the exception of I and Q, which covers a slightly larger range).
Inputs outside the valid range may cause exceptions or invalid outputs.
Supported color systems:
RGB: Red, Green, Blue components
YIQ: used by composite video signals
YIQ: Luminance, Chrominance (used by composite video signals)
HLS: Hue, Luminance, Saturation
HSV: Hue, Saturation, Value
"""
# References:
# XXX Where's the literature?
# http://en.wikipedia.org/wiki/YIQ
# http://en.wikipedia.org/wiki/HLS_color_space
# http://en.wikipedia.org/wiki/HSV_color_space
__all__ = ["rgb_to_yiq","yiq_to_rgb","rgb_to_hls","hls_to_rgb",
"rgb_to_hsv","hsv_to_rgb"]
@ -26,7 +30,6 @@ ONE_THIRD = 1.0/3.0
ONE_SIXTH = 1.0/6.0
TWO_THIRD = 2.0/3.0
# YIQ: used by composite video signals (linear combinations of RGB)
# Y: perceived grey level (0.0 == black, 1.0 == white)
# I, Q: color components
@ -50,10 +53,10 @@ def yiq_to_rgb(y, i, q):
return (r, g, b)
# HLS: Hue, Luminance, S???
# HLS: Hue, Luminance, Saturation
# H: position in the spectrum
# L: ???
# S: ???
# L: color lightness
# S: color saturation
def rgb_to_hls(r, g, b):
maxc = max(r, g, b)
@ -87,10 +90,10 @@ def _v(m1, m2, hue):
return m1
# HSV: Hue, Saturation, Value(?)
# HSV: Hue, Saturation, Value
# H: position in the spectrum
# S: ???
# V: ???
# S: color saturation ("purity")
# V: color brightness
def rgb_to_hsv(r, g, b):
maxc = max(r, g, b)