resize_images.py

from PIL import Image
import os, glob
import argparse

parser = argparse.ArgumentParser(
    prog="Bulk Image Resizer",
    description="Takes all JPG and PNG files in current directory & resizes width depending on command line arg"
)

parser.add_argument("max_width", type=int, help="If an image is larger than this the width is resized to equal this width")

argz = parser.parse_args()

print(argz.max_width)

breakpoint()

def resize_to_width(path_in, path_out, new_width):
    img = Image.open(path_in)
    w, h = img.size
        
    # calculate new height preserving aspect ratio
    new_height = int(h * (new_width / w))
        
    # resize
    resized = img.resize((new_width, new_height))
        
    resized.save(path_out)

image_files = glob.glob("*.[jJ][pP][gG]") + glob.glob("*.[pP][nN][gG]")

count = 0

for image_file in image_files:

    with Image.open(image_file) as image:
        file, ext = os.path.splitext(image_file)
        w, h = image.size

        if w > 2499:
            print(f"resizing: {image_file}")
            resize_to_width(image_file, f"resized/{file}__resized{ext.lower()}", 1500)
            count += 1


print(f"resized {count} images")