python——将图片转换为字符编码（linux版的）

1.首先更新pip3安装工具：
pip3 install --upgrade pip

2.下载机器猫的原图
wget http://labfile.oss.aliyuncs.com/courses/370/ascii_dora.png

3.下载python的图像支持库pillow(PIL)
pip3 install pillow


4.编辑文件（配置文件有附件）
vim ascii.py 

from PIL import Image
import argparse

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

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

def get_char(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)]

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 += get_char(*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)


5.运行配置文件，后边加图片的名称
python3 ascii.py ascii_dora.png


6.原图：