Python将图片转换为字符画的方法

# coding:utf-8  # 为一张图片生成对应的字符集图片  from PIL import Image import argparse  # 命令行输入参数处理 parser = argparse.ArgumentParser()  parser.add_argument('file')   # 输入文件 parser.add_argument('-o', '--output')  # 输出文件 parser.add_argument('--width', type=int, default=80) # 输出字符画宽 parser.add_argument('--height', type=int, default=80) # 输出字符画高  # 获取参数 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;:,/"^`'. ")   # 将256灰度映射到70个字符上 def get_char(r, b, g, 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    # 字符画输出到文件   if OUTPUT:     with open(OUTPUT,'w') as f:       f.write(txt)   else:     with open("output.txt", 'w') as f:       f.write(txt)