如何利用python实现图片转化字符画

img = Image.open(picPath)
img = img.resize((picW, picH))

from PIL import Image
lstChars = list("$@B%8&WM#*oahkbdpqwmZO0QLaCJUYXzczjhdhsdavunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'.") 
def oneChars(r, g, b, alpha = 256):
    global lstChars
    length = len(lstChars)
    gray = int(0.2126 * r + 0.7152 * g + 0.722 * b)
    index =length*gray
    return lstChars[index]
picPath = "C:\Users\Administrator\Desktop\\aaaaa\\aa.png"
picH = 40
picW =  80
img = Image.open(picPath)
img = img.resize((picW, picH))
txt = ""
for y in range(picH):
    for x in range(picW):
        txt += oneChars(img.getpixel((x, y)))
    txt += '\n'

print txt

# -*- coding=utf-8 -*-
from PIL import Image
IMG = 'IMG.jpg'  # 设置图片文件
WIDTH = 150  # 设置字符画的宽
HEIGHT = 80  # 设置字符画的高
OUTPUT = 'T.txt'  # 设置存放字符画的文本文件
ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")  # 设置显示的字符集
# 将256灰度映射到70个字符上
def get_char(r, g, b, alpha=256):
   # alpha为透明度
   # 判断 alpha 值，为0表示全透明
   if alpha == 0:
       return ' '
   # 获取字符集的长度，这里为 70
   length = len(ascii_char)
   # 将 RGB 值转为灰度值 gray，灰度值范围为 0-255
   gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)
   # 灰度值范围为 0-255，而字符集只有 70
   # 需要进行如下处理才能将灰度值映射到指定的字符上
   # 防止当灰度值为255时，输出的第70个字符超出列表索引，所以需要将(255+1)
   unit = (255.0 + 1) / length
   # 返回灰度值对应的字符
   return ascii_char[int(gray / unit)]
if __name__ == '__main__':

   # 打开并调整图片的宽和高
   im = Image.open(IMG)
   im = im.resize((WIDTH, HEIGHT), Image.NEAREST)

   # 初始化输出的字符串
   txt = ""
   # 遍历图片中的每一行
   for i in range(HEIGHT):
       # 遍历该行中的每一列
       for j in range(WIDTH):
           # 将 (j,i) 坐标的 RGB 像素转为字符后添加到 txt 字符串
           txt += get_char(*im.getpixel((j, i)))
       # 遍历完一行后需要增加换行符
       txt += '\n'
   # 输出到屏幕
   print(txt)
   with open(OUTPUT, 'w') as f:
       f.write(txt)