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"""
Part of the tagit module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# standard imports
import typing
# external imports
import PIL.Image
# exports
__all__: typing.Sequence[str] = (
'resize',
)
## code ##
def resize(
img: PIL.Image.Image,
max_size: int,
) -> PIL.Image.Image:
"""Resize an image to a given maximum side length."""
# determine target dimensions
ratio = img.width / img.height
if img.width > img.height:
width, height = max_size, round(max_size / ratio)
else:
width, height = round(ratio * max_size), max_size
# rescale and return
return img.resize(
(width, height),
resample=PIL.Image.Resampling.LANCZOS, # create high-quality image
reducing_gap=3.0, # optimize computation via fast size reduction
)
## EOF ##
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