What is the code for converting python images to character drawings?

Python picture to character drawing code: first calculate the grayscale value corresponding to the color of the picture; then according to the grayscale value, obtain the character corresponding to each pixel in the picture from the character set, the code is [args = parser .parse_args()].

The operating environment of this tutorial: Windows 7 system, python version 3.9, DELL G3 computer. This method is suitable for all brands of computers.

Related free learning recommendations: python video tutorial

Principle

1. Calculate the grayscale value corresponding to the color of the picture. The calculation formula is as follows

gray ＝ 0.2126 * r + 0.7152 * g + 0.0722 * b

2. According to the grayscale value, obtain the characters corresponding to each pixel in the image from the character set

Code

# !/usr/bin/env python
# -*- 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 = 50) #输出字符画宽
parser.add_argument('--height', type = int, default = 50) #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
# 字符画使用的字符集
ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")
def get_char(r,g,b,alpha = 256):
  """将256灰度映射到70个字符上"""
  if alpha == 0:
    return ' '
  length = len(ascii_char)
  # 计算灰度的公式
  gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)
  unit = (256.0 + 1)/length
  index=int(gray/unit)
  return ascii_char[index]
if __name__ == '__main__':
  im = Image.open(IMG)
  im = im.resize((WIDTH,HEIGHT), Image.NEAREST)
  txt = ""
  # 获取每个像素点对应的字符
  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)z

Running results

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