Python script to crop transparent pixels in .png images

crop_golfed.py

from PIL import Image
import numpy as np

def crop_blank_pixels(path: str):
    img = Image.open(path)
    are_transparent_pixels = np.array(img)[:, :, 3] != 0
    rows, cols = are_transparent_pixels.nonzero() # keep only non-transparent pixels
    img.crop((cols.min(), rows.min(), cols.max() + 1, rows.max() + 1)).save(path)

if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description='Crop blank pixels from images.')
    parser.add_argument('input_path', metavar='input_path', type=str, nargs='+', help='the path of the image to crop')
    args = parser.parse_args()

    for file_path in args.input_path:
        crop_blank_pixels(file_path)

requirements.txt

numpy==1.23.3
Pillow==10.0.0