img2ansi.py

import sys
from PIL import Image

if len(sys.argv) < 2:
    print(f'Usage: python3 {sys.argv[0]} /path/to/image [/path/to/output]')
    sys.exit(1)

f = sys.stdout if len(sys.argv) < 3 else open(sys.argv[2], 'w', encoding='utf-8')

literal = False

with Image.open(sys.argv[1]) as img:
    img = img.convert('RGBA')
    for y in range(0, img.size[1], 2):
        for x in range(img.size[0]):
            colorTop = img.getpixel((x, y))
            if colorTop[3] < 127:
                colorTop = None
            else:
                colorTop = colorTop[:3]

            if y + 1 < img.size[1]:
                colorBottom = img.getpixel((x, y + 1))
                if colorBottom[3] < 127:
                    colorBottom = None
                else:
                    colorBottom = colorBottom[:3]
            else:
                colorBottom = None

            if colorTop and colorBottom:
                output = '\x1b[38;2;{};{};{}m\x1b[48;2;{};{};{}m▀'.format(*colorTop[:3], *colorBottom[:3])
            elif colorTop:
                output = '\x1b[38;2;{};{};{}m\x1b[49m▀'.format(*colorTop[:3])
            elif colorBottom:
                output = '\x1b[38;2;{};{};{}m\x1b[49m▄'.format(*colorBottom[:3])
            else:
                output = '\x1b[0m '

            if literal:
                output = output.replace('\x1b', '\\x1b')
            f.write(output)

        f.write('\\x1b[0m\\n' if literal else '\x1b[0m\n')

f.close()