def background_color(self):
try:
hex_color = self.info['background_color']
except KeyError:
return TingApp.default_background_color
try:
color = _hex_color_to_tuple(hex_color)
except:
logging.exception('Failed to parse hex color, using default')
return TingApp.default_background_color
# colorsys works with colors between 0 and 1
fractional_color = _color_multiply(color, 1/255.0)
y, i, q = colorsys.rgb_to_yiq(*fractional_color)
if y > 0.6:
y = 0.6
fractional_color = colorsys.yiq_to_rgb(y, i, q)
color = _color_multiply(fractional_color, 255)
logging.warning(
'Background color was too bright (white text must be visible on top of this '
'color), color "%s" was darkened to "%s"' % (hex_color, _tuple_to_hex_color(color)))
return color
python类rgb_to_yiq()的实例源码
def test_yiq_values(self):
values = [
# rgb, yiq
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.11, -0.3217, 0.3121)), # blue
((0.0, 1.0, 0.0), (0.59, -0.2773, -0.5251)), # green
((0.0, 1.0, 1.0), (0.7, -0.599, -0.213)), # cyan
((1.0, 0.0, 0.0), (0.3, 0.599, 0.213)), # red
((1.0, 0.0, 1.0), (0.41, 0.2773, 0.5251)), # purple
((1.0, 1.0, 0.0), (0.89, 0.3217, -0.3121)), # yellow
((1.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.0, 0.0)), # grey
]
for (rgb, yiq) in values:
self.assertTripleEqual(yiq, colorsys.rgb_to_yiq(*rgb))
self.assertTripleEqual(rgb, colorsys.yiq_to_rgb(*yiq))
def test_yiq_values(self):
values = [
# rgb, yiq
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.11, -0.3217, 0.3121)), # blue
((0.0, 1.0, 0.0), (0.59, -0.2773, -0.5251)), # green
((0.0, 1.0, 1.0), (0.7, -0.599, -0.213)), # cyan
((1.0, 0.0, 0.0), (0.3, 0.599, 0.213)), # red
((1.0, 0.0, 1.0), (0.41, 0.2773, 0.5251)), # purple
((1.0, 1.0, 0.0), (0.89, 0.3217, -0.3121)), # yellow
((1.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.0, 0.0)), # grey
]
for (rgb, yiq) in values:
self.assertTripleEqual(yiq, colorsys.rgb_to_yiq(*rgb))
self.assertTripleEqual(rgb, colorsys.yiq_to_rgb(*yiq))
def yiq(self):
"""
Returns a 3-tuple of (y, i, q) float values; y values can be between
0.0 and 1.0, whilst i and q values can be between -1.0 and 1.0.
"""
return colorsys.rgb_to_yiq(self.red, self.green, self.blue)
def test_yiq_roundtrip(self):
for r in frange(0.0, 1.0, 0.2):
for g in frange(0.0, 1.0, 0.2):
for b in frange(0.0, 1.0, 0.2):
rgb = (r, g, b)
self.assertTripleEqual(
rgb,
colorsys.yiq_to_rgb(*colorsys.rgb_to_yiq(*rgb))
)
def darken_colors(self, data):
def change_color(color):
rgb = self._html_color_to_rgb(color)
if not rgb:
return color
yiq = colorsys.rgb_to_yiq(*(x / 255.0 for x in rgb))
if yiq[0] > self.MIN_Y_TO_DARKEN:
rgb = self._change_brightness(color, float(1 - (yiq[0] - self.MIN_Y_TO_DARKEN)))
return self._rgb_to_html_color(*rgb)
return color
if 'combined_colors' in data:
data['combined_colors'] = [change_color(color) for color in data['combined_colors']]
def test_yiq_roundtrip(self):
for r in frange(0.0, 1.0, 0.2):
for g in frange(0.0, 1.0, 0.2):
for b in frange(0.0, 1.0, 0.2):
rgb = (r, g, b)
self.assertTripleEqual(
rgb,
colorsys.yiq_to_rgb(*colorsys.rgb_to_yiq(*rgb))
)
def RGBToYIQ(red, green, blue):
return colorsys.rgb_to_yiq(
float(red) / 0xff, float(green) / 0xff, float(blue) / 0xff)
def get_random_pastel_color(tone=None, black_list: list=None) -> namedtuple:
"""Get a random dark or light color as string, useful for CSS styling."""
light_colors_tuple = (
'aliceblue', 'antiquewhite', 'aqua', 'aquamarine', 'azure', 'beige',
'cornsilk', 'floralwhite', 'ghostwhite', 'grey', 'honeydew', 'ivory',
'lavender', 'lavenderblush', 'lemonchiffon', 'lightcyan',
'lightgoldenrodyellow', 'lightgrey', 'lightpink', 'lightskyblue',
'lightyellow', 'linen', 'mint', 'mintcream', 'oldlace', 'papayawhip',
'peachpuff', 'seashell', 'skyblue', 'snow', 'thistle', 'white')
dark_colors_tuple = (
'brown', 'chocolate', 'crimson', 'darkblue', 'darkgoldenrod',
'darkgray', 'darkgreen', 'darkolivegreen', 'darkorange', 'darkred',
'darkslateblue', 'darkslategray', 'dimgray', 'dodgerblue',
'firebrick', 'forestgreen', 'indigo', 'maroon', 'mediumblue',
'midnightblue', 'navy', 'olive', 'olivedrab', 'royalblue',
'saddlebrown', 'seagreen', 'sienna', 'slategray', 'teal')
if tone.lower() == "light":
colors_tuple = light_colors_tuple
elif tone.lower() == "dark":
colors_tuple = dark_colors_tuple
else:
colors_tuple = light_colors_tuple + dark_colors_tuple
if black_list:
colors_tuple = tuple(set(colors_tuple).difference(set(black_list)))
color = choice(colors_tuple)
hexa = NAMED2HEX[color]
rgb = hex2rgb(hexa)
hls = rgb_to_hls(rgb.red, rgb.green, rgb.blue)
hsv = rgb_to_hsv(rgb.red, rgb.green, rgb.blue)
yiq = rgb_to_yiq(rgb.red, rgb.green, rgb.blue)
hls = namedtuple("HLS", "h l s")( # Round bcause default precision is huge
round(hls[0], 2), round(hls[1], 2), round(hls[2], 2))
hsv = namedtuple("HSV", "h s v")(
round(hsv[0], 2), round(hsv[1], 2), round(hsv[2], 2))
yiq = namedtuple("YIQ", "y i q")(
round(yiq[0], 2), round(yiq[1], 2), round(yiq[2], 2))
per = lambda value: int(value * 100 / 255) # To Percentage, 0~255 > 0~100%
return namedtuple("PastelColor", "name hex rgb hls hsv yiq css css_prcnt")(
color, hexa, rgb, hls, hsv, yiq,
f"rgb({rgb.red},{rgb.green},{rgb.blue})", # rgb(int, int, int)
f"rgb({per(rgb.red)}%,{per(rgb.green)}%,{per(rgb.blue)}%)") # rgb(%,%)
