Python-是否有函数或公式来查找rgb代码的互补色？

我试图在Python 3中找到一个好的公式来计算rgb代码的互补色,例如. a = b的互补.有没有办法做到这一点？

解决方法:

以下是如何直接计算RGB颜色的补码.它给出了与使用colorsys的算法相同的结果,如Iva Klass的答案所示,但在我的测试中,它的速度提高了约50％.请注意,它适用于任何RGB方案,RGB组件是整数还是浮点数无关紧要(只要每个组件使用相同的范围！).

函数hilo实现了一个简单的sorting network来对RGB组件进行排序.

# Sum of the min & max of (a, b, c)
def hilo(a, b, c):
    if c < b: b, c = c, b
    if b < a: a, b = b, a
    if c < b: b, c = c, b
    return a + c

def complement(r, g, b):
    k = hilo(r, g, b)
    return tuple(k - u for u in (r, g, b))

这是一个使用PIL / Pillow的简短演示.

#!/usr/bin/env python3

''' Complement the colours in a RGB image 

    Written by PM 2Ring 2016.10.08
'''

import sys
from PIL import Image

# Sum of the min & max of (a, b, c)
def hilo(a, b, c):
    if c < b: b, c = c, b
    if b < a: a, b = b, a
    if c < b: b, c = c, b
    return a + c

def complement(r, g, b):
    k = hilo(r, g, b)
    return tuple(k - u for u in (r, g, b))

def complement_image(iname, oname):
    print('Loading', iname)
    img = Image.open(iname)
    #img.show()

    size = img.size
    mode = img.mode
    in_data = img.getdata()

    print('Complementing...')
    out_img = Image.new(mode, size)
    out_img.putdata([complement(*rgb) for rgb in in_data])
    out_img.show()
    out_img.save(oname)
    print('Saved to', oname)

def main():
    if len(sys.argv) == 3:
        complement_image(*sys.argv[1:])
    else:
        fmt = 'Complement colours.\nUsage: {} input_image output_image'
        print(fmt.format(sys.argv[0]))

if __name__ == '__main__':
    main()

输入图像

输出图像

这是一个Numpy版本的complement_image.在我的机器上,它处理“眼镜”图像的速度比前一版本快3.7倍.

import numpy as np

def complement_image(iname, oname):
    print('Loading', iname)
    img = Image.open(iname)
    #img.show()

    in_data = np.asarray(img)
    #print(in_data.shape)

    print('Complementing...')
    lo = np.amin(in_data, axis=2, keepdims=True)
    hi = np.amax(in_data, axis=2, keepdims=True)
    out_data = (lo + hi) - in_data

    out_img = Image.fromarray(out_data)
    #out_img.show()
    out_img.save(oname)
    print('Saved to', oname)

标签：python-3-5,python,rgb,colors
来源： https://codeday.me/bug/20191008/1870920.html