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目的:将一张图片转换成字符画,采用灰度值与字符对应的算法实现像素与字符之间的转化,另外通过
argparse实现命令行参数管理,argparse其作用是为文件添加命令行参数并获取,用于程序运行输入
关键算法:
# 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) #灰度值计算公式
unit = (256.0 + 1) / length
return ascii_char[int(gray / unit)]
完整代碼:
# -*- 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,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)
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原文地址:http://www.cnblogs.com/perfe/p/5610223.html