Resize every image in a folder to create small and medium versions

thumbnail.py

"""
Resize every image in a folder to create small and medium versions.
"""

import pathlib
from PIL import Image


def resize_width(path: pathlib.Path, out_folder: str, new_width: int):
    """Resize a image to use the given width."""
    out_folder = pathlib.Path(out_folder)
    out_folder.mkdir(exist_ok=True)
    out_file = out_folder.joinpath(path.name)
    im = Image.open(path)
    width, height = im.size
    new_height = int(new_width / width * height)
    new_size = (new_width, new_height)
    im2 = im.resize(new_size)
    im2.save(out_file)
    print(f"Saved {new_size}: {out_file}")


def resize_height(path: pathlib.Path, out_folder: str, new_height: int):
    """Resize a image to use the given height."""
    out_folder = pathlib.Path(out_folder)
    out_folder.mkdir(exist_ok=True)
    out_file = out_folder.joinpath(path.name)
    im = Image.open(path)
    width, height = im.size
    new_width = int(new_height / height * width)
    new_size = (new_width, new_height)
    im2 = im.resize(new_size)
    im2.save(out_file)
    print(f"Saved {new_size}: {out_file}")


if __name__ == '__main__':

    source_folder = "./full/"  # contains original sized images

    for file in pathlib.Path(source_folder).glob("*.jpg"):
        resize_width(file, "./mid", 800)
        resize_height(file, "./thumb", 200)