主要使用 pillow  

如果没有安装 使用 pillow install pillow 安装一下

看代码：

from PIL import Image
import argparse

#字符画所用的字符集
ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")

def getChar(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)]

parser = argparse.ArgumentParser()

parser.add_argument('file')
parser.add_argument('-o','--output')
parser.add_argument('--width', type = int, default = 80)
parser.add_argument('--height', type = int, default = 80)

args = parser.parse_args()

IMG = args.file
WIDTH = args.width
HEIGHT = args.height
OUTPUT = args.output

if __name__ == '__main__':

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

    txt=""

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

    print(txt)

    if OUTPUT:
        with open(OUTPUT,'w') as f:
            f.write(txt)
    else:
        with open('output.txt','w') as f:
            f.write(txt)

再看带参数执行：