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 += "
"
    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.......