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 += '\n'

     print txt

 if __name__=="__main__":

     main()