Mercurial > cpython-lru_cache-weakref

annotate Lib/colorsys.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 61787533395c
children 80e9cb6163b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Conversion functions between RGB and other color systems.
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2
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3 This modules provides two functions for each color system ABC:
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4
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5 rgb_to_abc(r, g, b) --> a, b, c
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6 abc_to_rgb(a, b, c) --> r, g, b
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7
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8 All inputs and outputs are triples of floats in the range [0.0...1.0]
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9 (with the exception of I and Q, which covers a slightly larger range).
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10 Inputs outside the valid range may cause exceptions or invalid outputs.
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11
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12 Supported color systems:
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13 RGB: Red, Green, Blue components
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14 YIQ: Luminance, Chrominance (used by composite video signals)
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15 HLS: Hue, Luminance, Saturation
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16 HSV: Hue, Saturation, Value
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17 """
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18
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19 # References:
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20 # http://en.wikipedia.org/wiki/YIQ
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21 # http://en.wikipedia.org/wiki/HLS_color_space
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22 # http://en.wikipedia.org/wiki/HSV_color_space
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23
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24 __all__ = ["rgb_to_yiq","yiq_to_rgb","rgb_to_hls","hls_to_rgb",
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25 "rgb_to_hsv","hsv_to_rgb"]
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26
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27 # Some floating point constants
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28
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29 ONE_THIRD = 1.0/3.0
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30 ONE_SIXTH = 1.0/6.0
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31 TWO_THIRD = 2.0/3.0
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32
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33 # YIQ: used by composite video signals (linear combinations of RGB)
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34 # Y: perceived grey level (0.0 == black, 1.0 == white)
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35 # I, Q: color components
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36
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37 def rgb_to_yiq(r, g, b):
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38 y = 0.30*r + 0.59*g + 0.11*b
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39 i = 0.60*r - 0.28*g - 0.32*b
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40 q = 0.21*r - 0.52*g + 0.31*b
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41 return (y, i, q)
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42
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43 def yiq_to_rgb(y, i, q):
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44 r = y + 0.948262*i + 0.624013*q
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45 g = y - 0.276066*i - 0.639810*q
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46 b = y - 1.105450*i + 1.729860*q
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47 if r < 0.0:
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48 r = 0.0
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49 if g < 0.0:
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50 g = 0.0
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51 if b < 0.0:
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52 b = 0.0
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53 if r > 1.0:
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54 r = 1.0
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55 if g > 1.0:
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56 g = 1.0
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57 if b > 1.0:
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58 b = 1.0
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59 return (r, g, b)
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60
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61
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62 # HLS: Hue, Luminance, Saturation
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63 # H: position in the spectrum
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64 # L: color lightness
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65 # S: color saturation
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66
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67 def rgb_to_hls(r, g, b):
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68 maxc = max(r, g, b)
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69 minc = min(r, g, b)
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70 # XXX Can optimize (maxc+minc) and (maxc-minc)
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71 l = (minc+maxc)/2.0
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72 if minc == maxc:
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73 return 0.0, l, 0.0
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74 if l <= 0.5:
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75 s = (maxc-minc) / (maxc+minc)
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76 else:
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77 s = (maxc-minc) / (2.0-maxc-minc)
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78 rc = (maxc-r) / (maxc-minc)
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79 gc = (maxc-g) / (maxc-minc)
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80 bc = (maxc-b) / (maxc-minc)
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81 if r == maxc:
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82 h = bc-gc
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83 elif g == maxc:
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84 h = 2.0+rc-bc
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85 else:
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86 h = 4.0+gc-rc
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87 h = (h/6.0) % 1.0
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88 return h, l, s
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89
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90 def hls_to_rgb(h, l, s):
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91 if s == 0.0:
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92 return l, l, l
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93 if l <= 0.5:
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94 m2 = l * (1.0+s)
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95 else:
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96 m2 = l+s-(l*s)
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97 m1 = 2.0*l - m2
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98 return (_v(m1, m2, h+ONE_THIRD), _v(m1, m2, h), _v(m1, m2, h-ONE_THIRD))
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99
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100 def _v(m1, m2, hue):
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101 hue = hue % 1.0
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102 if hue < ONE_SIXTH:
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103 return m1 + (m2-m1)*hue*6.0
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104 if hue < 0.5:
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105 return m2
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106 if hue < TWO_THIRD:
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107 return m1 + (m2-m1)*(TWO_THIRD-hue)*6.0
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108 return m1
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109
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110
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111 # HSV: Hue, Saturation, Value
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112 # H: position in the spectrum
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113 # S: color saturation ("purity")
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114 # V: color brightness
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115
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116 def rgb_to_hsv(r, g, b):
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117 maxc = max(r, g, b)
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118 minc = min(r, g, b)
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119 v = maxc
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120 if minc == maxc:
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121 return 0.0, 0.0, v
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122 s = (maxc-minc) / maxc
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123 rc = (maxc-r) / (maxc-minc)
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124 gc = (maxc-g) / (maxc-minc)
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125 bc = (maxc-b) / (maxc-minc)
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126 if r == maxc:
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127 h = bc-gc
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128 elif g == maxc:
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129 h = 2.0+rc-bc
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130 else:
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131 h = 4.0+gc-rc
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132 h = (h/6.0) % 1.0
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133 return h, s, v
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134
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135 def hsv_to_rgb(h, s, v):
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136 if s == 0.0:
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137 return v, v, v
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138 i = int(h*6.0) # XXX assume int() truncates!
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139 f = (h*6.0) - i
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140 p = v*(1.0 - s)
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141 q = v*(1.0 - s*f)
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142 t = v*(1.0 - s*(1.0-f))
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143 i = i%6
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144 if i == 0:
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145 return v, t, p
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146 if i == 1:
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147 return q, v, p
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148 if i == 2:
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149 return p, v, t
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150 if i == 3:
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151 return p, q, v
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152 if i == 4:
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153 return t, p, v
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154 if i == 5:
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155 return v, p, q
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156 # Cannot get here