resizer.py

from PIL import Image
import pyexiv2


def resize_image(src_path, dst_path, size):
    # resize image
    image = Image.open(src_path)
    width, length = size
    if image.size[0] < image.size[1]:
        width, length = length, width
    image.thumbnail((width, length), Image.ANTIALIAS)
    image.save(dst_path, "JPEG")

    # copy EXIF data
    src_meta = pyexiv2.ImageMetadata(src_path)
    src_meta.read()
    dst_meta = pyexiv2.ImageMetadata(dst_path)
    dst_meta.read()
    src_meta.copy(dst_meta)

    # set EXIF image size info to resized size
    dst_meta["Exif.Photo.PixelXDimension"].value = image.size[0]
    dst_meta["Exif.Photo.PixelYDimension"].value = image.size[1]
    dst_meta.write()