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1# 

2# The Python Imaging Library 

3# $Id$ 

4# 

5# map CSS3-style colour description strings to RGB 

6# 

7# History: 

8# 2002-10-24 fl Added support for CSS-style color strings 

9# 2002-12-15 fl Added RGBA support 

10# 2004-03-27 fl Fixed remaining int() problems for Python 1.5.2 

11# 2004-07-19 fl Fixed gray/grey spelling issues 

12# 2009-03-05 fl Fixed rounding error in grayscale calculation 

13# 

14# Copyright (c) 2002-2004 by Secret Labs AB 

15# Copyright (c) 2002-2004 by Fredrik Lundh 

16# 

17# See the README file for information on usage and redistribution. 

18# 

19 

20import re 

21 

22from . import Image 

23 

24 

25def getrgb(color): 

26 """ 

27 Convert a color string to an RGB or RGBA tuple. If the string cannot be 

28 parsed, this function raises a :py:exc:`ValueError` exception. 

29 

30 .. versionadded:: 1.1.4 

31 

32 :param color: A color string 

33 :return: ``(red, green, blue[, alpha])`` 

34 """ 

35 if len(color) > 100: 35 ↛ 36line 35 didn't jump to line 36, because the condition on line 35 was never true

36 raise ValueError("color specifier is too long") 

37 color = color.lower() 

38 

39 rgb = colormap.get(color, None) 

40 if rgb: 

41 if isinstance(rgb, tuple): 

42 return rgb 

43 colormap[color] = rgb = getrgb(rgb) 

44 return rgb 

45 

46 # check for known string formats 

47 if re.match("#[a-f0-9]{3}$", color): 47 ↛ 48line 47 didn't jump to line 48, because the condition on line 47 was never true

48 return int(color[1] * 2, 16), int(color[2] * 2, 16), int(color[3] * 2, 16) 

49 

50 if re.match("#[a-f0-9]{4}$", color): 50 ↛ 51line 50 didn't jump to line 51, because the condition on line 50 was never true

51 return ( 

52 int(color[1] * 2, 16), 

53 int(color[2] * 2, 16), 

54 int(color[3] * 2, 16), 

55 int(color[4] * 2, 16), 

56 ) 

57 

58 if re.match("#[a-f0-9]{6}$", color): 58 ↛ 61line 58 didn't jump to line 61, because the condition on line 58 was never false

59 return int(color[1:3], 16), int(color[3:5], 16), int(color[5:7], 16) 

60 

61 if re.match("#[a-f0-9]{8}$", color): 

62 return ( 

63 int(color[1:3], 16), 

64 int(color[3:5], 16), 

65 int(color[5:7], 16), 

66 int(color[7:9], 16), 

67 ) 

68 

69 m = re.match(r"rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$", color) 

70 if m: 

71 return int(m.group(1)), int(m.group(2)), int(m.group(3)) 

72 

73 m = re.match(r"rgb\(\s*(\d+)%\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)$", color) 

74 if m: 

75 return ( 

76 int((int(m.group(1)) * 255) / 100.0 + 0.5), 

77 int((int(m.group(2)) * 255) / 100.0 + 0.5), 

78 int((int(m.group(3)) * 255) / 100.0 + 0.5), 

79 ) 

80 

81 m = re.match( 

82 r"hsl\(\s*(\d+\.?\d*)\s*,\s*(\d+\.?\d*)%\s*,\s*(\d+\.?\d*)%\s*\)$", color 

83 ) 

84 if m: 

85 from colorsys import hls_to_rgb 

86 

87 rgb = hls_to_rgb( 

88 float(m.group(1)) / 360.0, 

89 float(m.group(3)) / 100.0, 

90 float(m.group(2)) / 100.0, 

91 ) 

92 return ( 

93 int(rgb[0] * 255 + 0.5), 

94 int(rgb[1] * 255 + 0.5), 

95 int(rgb[2] * 255 + 0.5), 

96 ) 

97 

98 m = re.match( 

99 r"hs[bv]\(\s*(\d+\.?\d*)\s*,\s*(\d+\.?\d*)%\s*,\s*(\d+\.?\d*)%\s*\)$", color 

100 ) 

101 if m: 

102 from colorsys import hsv_to_rgb 

103 

104 rgb = hsv_to_rgb( 

105 float(m.group(1)) / 360.0, 

106 float(m.group(2)) / 100.0, 

107 float(m.group(3)) / 100.0, 

108 ) 

109 return ( 

110 int(rgb[0] * 255 + 0.5), 

111 int(rgb[1] * 255 + 0.5), 

112 int(rgb[2] * 255 + 0.5), 

113 ) 

114 

115 m = re.match(r"rgba\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$", color) 

116 if m: 

117 return int(m.group(1)), int(m.group(2)), int(m.group(3)), int(m.group(4)) 

118 raise ValueError(f"unknown color specifier: {repr(color)}") 

119 

120 

121def getcolor(color, mode): 

122 """ 

123 Same as :py:func:`~PIL.ImageColor.getrgb`, but converts the RGB value to a 

124 greyscale value if ``mode`` is not color or a palette image. If the string 

125 cannot be parsed, this function raises a :py:exc:`ValueError` exception. 

126 

127 .. versionadded:: 1.1.4 

128 

129 :param color: A color string 

130 :param mode: Convert result to this mode 

131 :return: ``(graylevel[, alpha]) or (red, green, blue[, alpha])`` 

132 """ 

133 # same as getrgb, but converts the result to the given mode 

134 color, alpha = getrgb(color), 255 

135 if len(color) == 4: 135 ↛ 136line 135 didn't jump to line 136, because the condition on line 135 was never true

136 color, alpha = color[:3], color[3] 

137 

138 if Image.getmodebase(mode) == "L": 138 ↛ 139line 138 didn't jump to line 139, because the condition on line 138 was never true

139 r, g, b = color 

140 # ITU-R Recommendation 601-2 for nonlinear RGB 

141 # scaled to 24 bits to match the convert's implementation. 

142 color = (r * 19595 + g * 38470 + b * 7471 + 0x8000) >> 16 

143 if mode[-1] == "A": 

144 return color, alpha 

145 else: 

146 if mode[-1] == "A": 146 ↛ 147line 146 didn't jump to line 147, because the condition on line 146 was never true

147 return color + (alpha,) 

148 return color 

149 

150 

151colormap = { 

152 # X11 colour table from https://drafts.csswg.org/css-color-4/, with 

153 # gray/grey spelling issues fixed. This is a superset of HTML 4.0 

154 # colour names used in CSS 1. 

155 "aliceblue": "#f0f8ff", 

156 "antiquewhite": "#faebd7", 

157 "aqua": "#00ffff", 

158 "aquamarine": "#7fffd4", 

159 "azure": "#f0ffff", 

160 "beige": "#f5f5dc", 

161 "bisque": "#ffe4c4", 

162 "black": "#000000", 

163 "blanchedalmond": "#ffebcd", 

164 "blue": "#0000ff", 

165 "blueviolet": "#8a2be2", 

166 "brown": "#a52a2a", 

167 "burlywood": "#deb887", 

168 "cadetblue": "#5f9ea0", 

169 "chartreuse": "#7fff00", 

170 "chocolate": "#d2691e", 

171 "coral": "#ff7f50", 

172 "cornflowerblue": "#6495ed", 

173 "cornsilk": "#fff8dc", 

174 "crimson": "#dc143c", 

175 "cyan": "#00ffff", 

176 "darkblue": "#00008b", 

177 "darkcyan": "#008b8b", 

178 "darkgoldenrod": "#b8860b", 

179 "darkgray": "#a9a9a9", 

180 "darkgrey": "#a9a9a9", 

181 "darkgreen": "#006400", 

182 "darkkhaki": "#bdb76b", 

183 "darkmagenta": "#8b008b", 

184 "darkolivegreen": "#556b2f", 

185 "darkorange": "#ff8c00", 

186 "darkorchid": "#9932cc", 

187 "darkred": "#8b0000", 

188 "darksalmon": "#e9967a", 

189 "darkseagreen": "#8fbc8f", 

190 "darkslateblue": "#483d8b", 

191 "darkslategray": "#2f4f4f", 

192 "darkslategrey": "#2f4f4f", 

193 "darkturquoise": "#00ced1", 

194 "darkviolet": "#9400d3", 

195 "deeppink": "#ff1493", 

196 "deepskyblue": "#00bfff", 

197 "dimgray": "#696969", 

198 "dimgrey": "#696969", 

199 "dodgerblue": "#1e90ff", 

200 "firebrick": "#b22222", 

201 "floralwhite": "#fffaf0", 

202 "forestgreen": "#228b22", 

203 "fuchsia": "#ff00ff", 

204 "gainsboro": "#dcdcdc", 

205 "ghostwhite": "#f8f8ff", 

206 "gold": "#ffd700", 

207 "goldenrod": "#daa520", 

208 "gray": "#808080", 

209 "grey": "#808080", 

210 "green": "#008000", 

211 "greenyellow": "#adff2f", 

212 "honeydew": "#f0fff0", 

213 "hotpink": "#ff69b4", 

214 "indianred": "#cd5c5c", 

215 "indigo": "#4b0082", 

216 "ivory": "#fffff0", 

217 "khaki": "#f0e68c", 

218 "lavender": "#e6e6fa", 

219 "lavenderblush": "#fff0f5", 

220 "lawngreen": "#7cfc00", 

221 "lemonchiffon": "#fffacd", 

222 "lightblue": "#add8e6", 

223 "lightcoral": "#f08080", 

224 "lightcyan": "#e0ffff", 

225 "lightgoldenrodyellow": "#fafad2", 

226 "lightgreen": "#90ee90", 

227 "lightgray": "#d3d3d3", 

228 "lightgrey": "#d3d3d3", 

229 "lightpink": "#ffb6c1", 

230 "lightsalmon": "#ffa07a", 

231 "lightseagreen": "#20b2aa", 

232 "lightskyblue": "#87cefa", 

233 "lightslategray": "#778899", 

234 "lightslategrey": "#778899", 

235 "lightsteelblue": "#b0c4de", 

236 "lightyellow": "#ffffe0", 

237 "lime": "#00ff00", 

238 "limegreen": "#32cd32", 

239 "linen": "#faf0e6", 

240 "magenta": "#ff00ff", 

241 "maroon": "#800000", 

242 "mediumaquamarine": "#66cdaa", 

243 "mediumblue": "#0000cd", 

244 "mediumorchid": "#ba55d3", 

245 "mediumpurple": "#9370db", 

246 "mediumseagreen": "#3cb371", 

247 "mediumslateblue": "#7b68ee", 

248 "mediumspringgreen": "#00fa9a", 

249 "mediumturquoise": "#48d1cc", 

250 "mediumvioletred": "#c71585", 

251 "midnightblue": "#191970", 

252 "mintcream": "#f5fffa", 

253 "mistyrose": "#ffe4e1", 

254 "moccasin": "#ffe4b5", 

255 "navajowhite": "#ffdead", 

256 "navy": "#000080", 

257 "oldlace": "#fdf5e6", 

258 "olive": "#808000", 

259 "olivedrab": "#6b8e23", 

260 "orange": "#ffa500", 

261 "orangered": "#ff4500", 

262 "orchid": "#da70d6", 

263 "palegoldenrod": "#eee8aa", 

264 "palegreen": "#98fb98", 

265 "paleturquoise": "#afeeee", 

266 "palevioletred": "#db7093", 

267 "papayawhip": "#ffefd5", 

268 "peachpuff": "#ffdab9", 

269 "peru": "#cd853f", 

270 "pink": "#ffc0cb", 

271 "plum": "#dda0dd", 

272 "powderblue": "#b0e0e6", 

273 "purple": "#800080", 

274 "rebeccapurple": "#663399", 

275 "red": "#ff0000", 

276 "rosybrown": "#bc8f8f", 

277 "royalblue": "#4169e1", 

278 "saddlebrown": "#8b4513", 

279 "salmon": "#fa8072", 

280 "sandybrown": "#f4a460", 

281 "seagreen": "#2e8b57", 

282 "seashell": "#fff5ee", 

283 "sienna": "#a0522d", 

284 "silver": "#c0c0c0", 

285 "skyblue": "#87ceeb", 

286 "slateblue": "#6a5acd", 

287 "slategray": "#708090", 

288 "slategrey": "#708090", 

289 "snow": "#fffafa", 

290 "springgreen": "#00ff7f", 

291 "steelblue": "#4682b4", 

292 "tan": "#d2b48c", 

293 "teal": "#008080", 

294 "thistle": "#d8bfd8", 

295 "tomato": "#ff6347", 

296 "turquoise": "#40e0d0", 

297 "violet": "#ee82ee", 

298 "wheat": "#f5deb3", 

299 "white": "#ffffff", 

300 "whitesmoke": "#f5f5f5", 

301 "yellow": "#ffff00", 

302 "yellowgreen": "#9acd32", 

303}