python学习 —— 字符画

　　代码：

import os
from PIL import Image

WIDTH = int(250)
HEIGHT = int(250/2)

ascii_char = list('toahkbdpqwmZO0QLCJUYXzcvunxrjf$@B%8&WM#*/\|()1{}[.?-_+~<>i!lI;:,"^`\'  ')

# 将256灰度映射到70个字符上
def rgb2char(r,g,b,alpha = 256):
    if alpha == 0:
        return ' '
    length = len(ascii_char)
    gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)

    unit = (256.0 + 1)/length
    return ascii_char[int(gray/unit)]

def run(IMG):
    im = Image.open(IMG)
    im = im.resize((WIDTH, HEIGHT), Image.NEAREST)

    txt = ''

    for i in range(HEIGHT):
        for j in range(WIDTH):
            txt += rgb2char(*im.getpixel((j, i)))
        txt += '\n'
    return txt

if __name__ == '__main__':

    IMG = '*.jpg'
    txt = run(IMG)
    print(txt)

    #with open('output.txt','w') as f:
        #f.write(txt)