如何在Python中将RGB转换为CMYK和反之亦然？ [英] How can I convert RGB to CMYK and vice versa in python?

问题描述

如果我有一个RGB十进制，例如 255，165，0 ，我该怎么做才能将其转换为CMYK？

If I had a RGB decimal such as 255, 165, 0, what could I do to convert this to CMYK?

例如：

>>> red, green, blue = 255, 165, 0
>>> rgb_to_cmyk(red, green, blue)
(0, 35, 100, 0)

推荐答案

这里是一个 Javascript实现的Python端口。

Here's a Python port of a Javascript implementation.

cmyk_scale = 100

def rgb_to_cmyk(r,g,b):
    if (r == 0) and (g == 0) and (b == 0):
        # black
        return 0, 0, 0, cmyk_scale

    # rgb [0,255] -> cmy [0,1]
    c = 1 - r / 255.
    m = 1 - g / 255.
    y = 1 - b / 255.

    # 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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