drawpic.py

#!/usr/bin/env python3

from PIL import Image
import concurrent.futures
from colorfinder import hex2term_accurate, hex2term_quick
from lolcat import get_terminal_size
import argparse

if __name__ == "__main__":
    default_size = get_terminal_size()

    parser = argparse.ArgumentParser()
    parser.add_argument("file", help="path to the image", type=Image.open)
    parser.add_argument("-c", "--col", help="number of cols",
                        type=int, default=default_size[1])
    parser.add_argument("-r", "--row", help="number of rows", 
                        type=int, default=default_size[0])
    parser.add_argument("-f", "--fast", help="use a faster algorithm", 
                        action="store_true")

    args = parser.parse_args()
    coln, rown = args.col, args.row
    hex2term = hex2term_quick if args.fast else hex2term_accurate
    im = args.file.resize((coln, rown), Image.ANTIALIAS).convert("RGB")

    def generate_line(row):
        ret = ""
        for j in range(coln):
            r, g, b = im.getpixel((j, row))
            res = hex2term("#%02x%02x%02x" % (r, g, b))
            ret += '\x1b[48;5;{c}m \x1b[0m'.format(c=res)
        return ret

    with concurrent.futures.ProcessPoolExecutor() as executor:
        for i in executor.map(generate_line, range(rown)):
            print(i)

lolcat.py: https://gist.github.com/lilydjwg/9891346
colorfinder.py: https://github.com/lilydjwg/winterpy/blob/master/pylib/colorfinder.py