用Python编写一个能将图片转换为字符画的程序

\# -*- coding=utf-8 -*- 

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,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)] 



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)