def rgb2Name(rgb):
"""Method to convert RGB to a name. Answer None if no name can be found.
>>> rgb2Name((0.2, 0.3, 0.4)) in ('darkslategray', 'darkslategrey')
True
>>> color(spot=300).name in ('teal', 'darkcyan')
True
>>> color(spot=0).name
'black'
>>> color(rgb=(0.4, 0.5, 0.6)).name in ('slategrey', 'slategray')
True
>>> color(cmyk=(0.2, 0.2, 0.6, 0.2)).name
'darkkhaki'
>>> rgb = (0.4, 0.5, 0.6)
>>> color(rgb=rgb).name == rgb2Name(rgb)
True
"""
rgbName = None
r, g, b = rgb
error = None # Max error for the 3 colors
for name, value in CSS_COLOR_NAMES.items():
nr, ng, nb = int2Rgb(value)
e = abs(nr - r) + abs(ng - g) + abs(nb - b)
if error is None or e < error:
rgbName = name
error = e
return rgbName
def _get_name(self):
u"""Answer the name of the CSS color that is closest to the current
self.rgb
>>> Color('red').name
'red'
>>> Color(0x00fa9a).name
'mediumspringgreen'
>>> Color(0x800000).name
'maroon'
>>> Color(0x828085).name # Real value is 0x808080
'gray'
>>> Color(0xffe4e1).name, Color(0xffe4f1).name, Color(0xffe4f8).name
('mistyrose', 'mistyrose', 'lavenderblush')
"""
if self._name is None:
r, g, b = self.rgb
error = 3 # Max error for the 3 colors
for name, value in CSS_COLOR_NAMES.items():
nr, ng, nb = self.int2Rgb(value)
e = abs(nr - r) + abs(ng - g) + abs(nb - b)
if e < error:
self._name = name
error = e
return self._name
def name2Rgb(name):
"""Method to convert a name to RGB. Answer None if no RGB can be found.
>>> name2Rgb('red')
(1, 0, 0)
>>> name2Rgb('white')
(1, 1, 1)
>>> colorName = 'slategray'
>>> # Get nearest rounded (r,g,b) for this spot color.
>>> rgb = name2Rgb(colorName)
>>> '%0.2f, %0.2f, %0.2f' % rgb
'0.44, 0.50, 0.56'
"""
return int2Rgb(CSS_COLOR_NAMES.get(name))