Image Splitter

imsplit.py

#!/usr/bin/env python

from PIL import Image

image = Image.open("base.png")

def is_empty(line):
        for x in range(line.width):
                r, g, b, a = line.getpixel((x, 0))
                if r + g + b + a > 0:
                        return False
        return True


def crop_rows(im):
        minY = 0
        was_full = False
        rows = []
        for y in range(im.height):
                line = im.crop((0, y, im.width, y + 1))
                full = not is_empty(line)

                if not full and was_full:
                        rows.append(im.crop((0, minY, im.width, y)))
                elif full and not was_full:
                        minY = y

                was_full = full
        
        return rows


 
rows = crop_rows(image)

n = 0
for row in rows:
        rot = row.transpose(Image.ROTATE_90).transpose(Image.FLIP_TOP_BOTTOM)
        tiles = crop_rows(rot)
        for t in tiles:
                r,g,b,a = t.resize((1,1)).getpixel((0,0))
                if r + g + b + a > 0:
                        f = t.transpose(Image.ROTATE_270).transpose(Image.FLIP_LEFT_RIGHT)
                        f.save("%s_%sx%s.png" % (n, f.width, f.height), "PNG")
                        n += 1