1#!/usr/bin/env python3
2"""
3This is a script for creating colour-tinted versions of greyscale images.
4
5It works by creating an RGBA image which has the specified colour
6on every pixel, then controlling the intensity with the alpha value.
7
8I don't use it especially often, but I thought it was a neat trick and
9I wanted to save it for future use.
10"""
11
12import sys
13
14from PIL import Image
15
16
17if __name__ == "__main__":
18    try:
19        path = sys.argv[1]
20        hex_colour = sys.argv[2]
21    except IndexError:
22        sys.exit(f"Usage: {__file__} <PATH> <HEX_COLOUR>")
23
24    red = int(hex_colour[1:3], 16)
25    green = int(hex_colour[3:5], 16)
26    blue = int(hex_colour[5:7], 16)
27
28    im = Image.open(path)
29    im = im.convert("L")
30    pixels = list(im.getdata())
31    tinted_im = Image.new("RGBA", im.size)
32
33    if im.mode == "L":
34        tinted_im.putdata([(red, green, blue, 255 - p) for p in pixels])
35    else:
36        tinted_im.putdata([(red, green, blue, 255 - p[0]) for p in pixels])
37
38    name, _ = path.rsplit(".", 1)
39    out_path = f"{name}.{hex_colour.strip('#')}.png"
40
41    tinted_im.save(out_path)
42    print(out_path)