这是Javascript实现的Python端口。
RGB_SCALE = 255
CMYK_SCALE = 100
def rgb_to_cmyk(r, g, b):
if (r, g, b) == (0, 0, 0):
# black
return 0, 0, 0, CMYK_SCALE
# rgb [0,255] -> cmy [0,1]
c = 1 - r / RGB_SCALE
m = 1 - g / RGB_SCALE
y = 1 - b / RGB_SCALE
# extract out k [0, 1]
min_cmy = min(c, m, y)
c = (c - min_cmy) / (1 - min_cmy)
m = (m - min_cmy) / (1 - min_cmy)
y = (y - min_cmy) / (1 - min_cmy)
k = min_cmy
# rescale to the range [0,CMYK_SCALE]
return c * CMYK_SCALE, m * CMYK_SCALE, y * CMYK_SCALE, k * CMYK_SCALE
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