Python Script for Converting Images to ASCII Art

This tutorial explains how to transform an image into ASCII art using a Python script. The script first computes the grayscale value of each pixel with the luminance formula gray = 0.2126 * r + 0.7152 * g + 0.0722 * b , then selects a corresponding character from a predefined character set to represent that pixel.

# !/usr/bin/env python # -*- coding:utf-8 -*- from PIL import Image import argparse 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 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;:,\"^`'. ") 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) gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b) unit = (256.0 / length) index = int(gray / unit) return ascii_char[index] 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) if OUTPUT: with open(OUTPUT, 'w') as f: f.write(txt) else: with open("output.txt", 'w') as f: f.write(txt)

The script outputs the generated ASCII art to the console and optionally writes it to a file; example screenshots of the resulting text art are shown in the original article.