python小项目练习之转换像素图片为字符图

实例来源实验楼网站，没事可以多逛逛，在此多谢实验楼的无私分享

from PIL import Image
import argparse

"""
description:
    将图片像素转换为字母重新绘制输出
"""

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

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

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)]

def 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 += '
'    
    print txt

if __name__=="__main__":
    main()

在文件所在的当前目录存放待转换图片，直接执行命令： python convert.py test.png