Source code for imgwrench.commands.resize

"""Resize images to a maximum side length preserving aspect ratio."""

import click
from PIL import Image


def resize(image, maxsize):
    """Resize image to maxsize (longer) side length preserving aspect ratio."""
    ratio = float(maxsize) / max(image.size)
    return image.resize(
        (int(image.size[0] * ratio), int(image.size[1] * ratio)), Image.LANCZOS
    )


@click.command(name="resize")
@click.option(
    "-m",
    "--maxsize",
    type=click.INT,
    default=1024,
    show_default=True,
    help="size of the longer side (width or height) in pixels",
)
def cli_resize(maxsize):
    """Resize images to a maximum side length preserving aspect ratio."""
    click.echo("Initializing resize with parameters {}".format(locals()))

    def _resize(images):
        for info, image in images:
            yield info, resize(image, maxsize)

    return _resize