def slice(filename, number_tiles, save=True):
"""
Split an image into a specified number of tiles.
Args:
filename (str): The filename of the image to split.
number_tiles (int): The number of tiles required.
Kwargs:
save (bool): Whether or not to save tiles to disk.
Returns:
Tuple of :class:`Tile` instances.
"""
im = Image.open(filename)
validate_image(im, number_tiles)
im_w, im_h = im.size
columns, rows = calc_columns_rows(number_tiles)
extras = (columns * rows) - number_tiles
tile_w, tile_h = int(floor(im_w / columns)), int(floor(im_h / rows))
tiles = []
number = 1
for pos_y in range(0, im_h - rows, tile_h): # -rows for rounding error.
for pos_x in range(0, im_w - columns, tile_w): # as above.
area = (pos_x, pos_y, pos_x + tile_w, pos_y + tile_h)
image = im.crop(area)
position = (int(floor(pos_x / tile_w)) + 1,
int(floor(pos_y / tile_h)) + 1)
coords = (pos_x, pos_y)
tile = Tile(image, number, position, coords)
tiles.append(tile)
number += 1
if save:
save_tiles(tiles,
prefix=get_basename(filename),
directory=os.path.dirname(filename))
return tuple(tiles)
def basename(self):
"""Strip path and extension. Return base filename."""
return get_basename(self.filename)