python3----练习题(图片转字符画)

 import argparse
 from PIL import Image

 def parse_param():
     parser = argparse.ArgumentParser()   # 命令行输入参数处理

     parser.add_argument("input_file")  # 输入文件
     parser.add_argument("out_file")    # 输出文件

     parser.add_argument("--width", type=int, default=50)  # 输出字符画宽
     parser.add_argument("--height", type=int, default=50)  # 输出字符画高

     args = parser.parse_args()   # 获取参数
     width, height, input_file, out_file = args.width, args.height, args.input_file, args.out_file
     return width, height, input_file, out_file

 def get_char(r, g, b, alpha=256):
     '''
     gray / 256 = x / len(ascii_chra)

     '''
     if alpha == 0:
         return " "
     gray = (2126 * r + 7152 * g + 722 * b)/10000
     # 将256灰度映射到70个字符上
     ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")
     x = int((gray / (alpha + 1.0)) * len(ascii_char))
     return ascii_char[x]

 def write_file(out_file_name, content):
     with open(out_file_name, "w") as f:
         f.write(content)

 def main(file_name="test.jpg", width=80, height=80, out_file_name="out_file"):
     text = ""
     im = Image.open(file_name)
     im = im.resize((width, height), Image.NEAREST)
     for i in range(height):
         for j in range(width):
             content = im.getpixel((j, i))
         text += get_char(*content)
         text += "\n"
     print(text)
     write_file(out_file_name, text)   # 字符画出到文件

 if __name__ == '__main__':
     main()

 图片测试:
 http://labfile.oss.aliyuncs.com/courses/370/ascii_dora.png

待完善.......