280 lines
7.8 KiB
Python
280 lines
7.8 KiB
Python
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#
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# The Python Imaging Library
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# $Id$
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#
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# map CSS3-style colour description strings to RGB
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#
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# History:
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# 2002-10-24 fl Added support for CSS-style color strings
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# 2002-12-15 fl Added RGBA support
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# 2004-03-27 fl Fixed remaining int() problems for Python 1.5.2
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# 2004-07-19 fl Fixed gray/grey spelling issues
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# 2009-03-05 fl Fixed rounding error in grayscale calculation
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#
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# Copyright (c) 2002-2004 by Secret Labs AB
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# Copyright (c) 2002-2004 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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from PIL import Image
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import re
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def getrgb(color):
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"""
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Convert a color string to an RGB tuple. If the string cannot be parsed,
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this function raises a :py:exc:`ValueError` exception.
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.. versionadded:: 1.1.4
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:param color: A color string
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:return: ``(red, green, blue[, alpha])``
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"""
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try:
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rgb = colormap[color]
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except KeyError:
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try:
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# fall back on case-insensitive lookup
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rgb = colormap[color.lower()]
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except KeyError:
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rgb = None
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# found color in cache
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if rgb:
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if isinstance(rgb, tuple):
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return rgb
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colormap[color] = rgb = getrgb(rgb)
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return rgb
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# check for known string formats
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m = re.match("#\w\w\w$", color)
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if m:
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return (
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int(color[1]*2, 16),
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int(color[2]*2, 16),
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int(color[3]*2, 16)
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)
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m = re.match("#\w\w\w\w\w\w$", color)
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if m:
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return (
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int(color[1:3], 16),
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int(color[3:5], 16),
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int(color[5:7], 16)
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)
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m = re.match("rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$", color)
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if m:
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return (
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int(m.group(1)),
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int(m.group(2)),
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int(m.group(3))
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)
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m = re.match("rgb\(\s*(\d+)%\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)$", color)
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if m:
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return (
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int((int(m.group(1)) * 255) / 100.0 + 0.5),
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int((int(m.group(2)) * 255) / 100.0 + 0.5),
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int((int(m.group(3)) * 255) / 100.0 + 0.5)
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)
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m = re.match("hsl\(\s*(\d+)\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)$", color)
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if m:
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from colorsys import hls_to_rgb
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rgb = hls_to_rgb(
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float(m.group(1)) / 360.0,
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float(m.group(3)) / 100.0,
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float(m.group(2)) / 100.0,
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)
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return (
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int(rgb[0] * 255 + 0.5),
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int(rgb[1] * 255 + 0.5),
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int(rgb[2] * 255 + 0.5)
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)
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m = re.match("rgba\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$",
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color)
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if m:
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return (
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int(m.group(1)),
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int(m.group(2)),
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int(m.group(3)),
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int(m.group(4))
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)
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raise ValueError("unknown color specifier: %r" % color)
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def getcolor(color, mode):
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"""
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Same as :py:func:`~PIL.ImageColor.getrgb`, but converts the RGB value to a
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greyscale value if the mode is not color or a palette image. If the string
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cannot be parsed, this function raises a :py:exc:`ValueError` exception.
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.. versionadded:: 1.1.4
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:param color: A color string
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:return: ``(graylevel [, alpha]) or (red, green, blue[, alpha])``
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"""
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# same as getrgb, but converts the result to the given mode
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color, alpha = getrgb(color), 255
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if len(color) == 4:
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color, alpha = color[0:3], color[3]
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if Image.getmodebase(mode) == "L":
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r, g, b = color
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color = (r*299 + g*587 + b*114)//1000
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if mode[-1] == 'A':
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return (color, alpha)
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else:
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if mode[-1] == 'A':
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return color + (alpha,)
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return color
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colormap = {
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# X11 colour table (from "CSS3 module: Color working draft"), with
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# gray/grey spelling issues fixed. This is a superset of HTML 4.0
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# colour names used in CSS 1.
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"aliceblue": "#f0f8ff",
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"antiquewhite": "#faebd7",
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"aqua": "#00ffff",
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"aquamarine": "#7fffd4",
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"azure": "#f0ffff",
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"beige": "#f5f5dc",
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"bisque": "#ffe4c4",
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"black": "#000000",
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"blanchedalmond": "#ffebcd",
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"blue": "#0000ff",
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"blueviolet": "#8a2be2",
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"brown": "#a52a2a",
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"burlywood": "#deb887",
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"cadetblue": "#5f9ea0",
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"chartreuse": "#7fff00",
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"chocolate": "#d2691e",
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"coral": "#ff7f50",
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"cornflowerblue": "#6495ed",
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"cornsilk": "#fff8dc",
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"crimson": "#dc143c",
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"cyan": "#00ffff",
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"darkblue": "#00008b",
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"darkcyan": "#008b8b",
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"darkgoldenrod": "#b8860b",
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"darkgray": "#a9a9a9",
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"darkgrey": "#a9a9a9",
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"darkgreen": "#006400",
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"darkkhaki": "#bdb76b",
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"darkmagenta": "#8b008b",
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"darkolivegreen": "#556b2f",
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"darkorange": "#ff8c00",
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"darkorchid": "#9932cc",
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"darkred": "#8b0000",
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"darksalmon": "#e9967a",
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"darkseagreen": "#8fbc8f",
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"darkslateblue": "#483d8b",
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"darkslategray": "#2f4f4f",
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"darkslategrey": "#2f4f4f",
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"darkturquoise": "#00ced1",
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"darkviolet": "#9400d3",
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"deeppink": "#ff1493",
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"deepskyblue": "#00bfff",
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"dimgray": "#696969",
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"dimgrey": "#696969",
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"dodgerblue": "#1e90ff",
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"firebrick": "#b22222",
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"floralwhite": "#fffaf0",
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"forestgreen": "#228b22",
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"fuchsia": "#ff00ff",
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"gainsboro": "#dcdcdc",
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"ghostwhite": "#f8f8ff",
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"gold": "#ffd700",
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"goldenrod": "#daa520",
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"gray": "#808080",
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"grey": "#808080",
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"green": "#008000",
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"greenyellow": "#adff2f",
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"honeydew": "#f0fff0",
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"hotpink": "#ff69b4",
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"indianred": "#cd5c5c",
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"indigo": "#4b0082",
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"ivory": "#fffff0",
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"khaki": "#f0e68c",
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"lavender": "#e6e6fa",
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"lavenderblush": "#fff0f5",
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"lawngreen": "#7cfc00",
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"lemonchiffon": "#fffacd",
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"lightblue": "#add8e6",
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"lightcoral": "#f08080",
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"lightcyan": "#e0ffff",
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"lightgoldenrodyellow": "#fafad2",
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"lightgreen": "#90ee90",
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"lightgray": "#d3d3d3",
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"lightgrey": "#d3d3d3",
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"lightpink": "#ffb6c1",
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"lightsalmon": "#ffa07a",
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"lightseagreen": "#20b2aa",
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"lightskyblue": "#87cefa",
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"lightslategray": "#778899",
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"lightslategrey": "#778899",
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"lightsteelblue": "#b0c4de",
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"lightyellow": "#ffffe0",
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"lime": "#00ff00",
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"limegreen": "#32cd32",
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"linen": "#faf0e6",
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"magenta": "#ff00ff",
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"maroon": "#800000",
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"mediumaquamarine": "#66cdaa",
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"mediumblue": "#0000cd",
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"mediumorchid": "#ba55d3",
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"mediumpurple": "#9370db",
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"mediumseagreen": "#3cb371",
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"mediumslateblue": "#7b68ee",
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"mediumspringgreen": "#00fa9a",
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"mediumturquoise": "#48d1cc",
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"mediumvioletred": "#c71585",
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"midnightblue": "#191970",
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"mintcream": "#f5fffa",
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"mistyrose": "#ffe4e1",
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"moccasin": "#ffe4b5",
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"navajowhite": "#ffdead",
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"navy": "#000080",
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"oldlace": "#fdf5e6",
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"olive": "#808000",
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"olivedrab": "#6b8e23",
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"orange": "#ffa500",
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"orangered": "#ff4500",
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"orchid": "#da70d6",
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"palegoldenrod": "#eee8aa",
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"palegreen": "#98fb98",
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"paleturquoise": "#afeeee",
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"palevioletred": "#db7093",
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"papayawhip": "#ffefd5",
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"peachpuff": "#ffdab9",
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"peru": "#cd853f",
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"pink": "#ffc0cb",
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"plum": "#dda0dd",
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"powderblue": "#b0e0e6",
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"purple": "#800080",
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"red": "#ff0000",
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"rosybrown": "#bc8f8f",
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"royalblue": "#4169e1",
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"saddlebrown": "#8b4513",
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"salmon": "#fa8072",
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"sandybrown": "#f4a460",
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"seagreen": "#2e8b57",
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"seashell": "#fff5ee",
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"sienna": "#a0522d",
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"silver": "#c0c0c0",
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"skyblue": "#87ceeb",
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"slateblue": "#6a5acd",
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"slategray": "#708090",
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"slategrey": "#708090",
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"snow": "#fffafa",
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"springgreen": "#00ff7f",
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"steelblue": "#4682b4",
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"tan": "#d2b48c",
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"teal": "#008080",
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"thistle": "#d8bfd8",
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"tomato": "#ff6347",
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"turquoise": "#40e0d0",
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"violet": "#ee82ee",
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"wheat": "#f5deb3",
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"white": "#ffffff",
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"whitesmoke": "#f5f5f5",
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"yellow": "#ffff00",
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"yellowgreen": "#9acd32",
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}
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