python图片彩色转黑白处理

[python]代码库

#!/usr/bin/env python
# encoding: utf-8

import numpy as np
from PIL import Image


class picture:

    def __init__(self):
        self.path = 'assets/picture.jpeg'

    def hello(self):
        '''
        This is a welcome speech
        :return: self
        '''
       
        return self

    def run(self):
        '''
        The program entry
        '''
        im = self.to_black_white()
        im.show()
        im.save('assets/black_white.jpeg')

    def to_black_white(self):
        '''
        Picture to black white
        '''
        im = np.asarray(Image.open(self.path).convert('RGB'))
        trans = np.array([[0.299, 0.587, 0.114], [0.299, 0.587, 0.114], [0.299, 0.587, 0.114]]).transpose()
        im = np.dot(im, trans)
        return Image.fromarray(np.array(im).astype('uint8'))


if __name__ == '__main__':
    picture().hello().run()

[代码运行效果截图]