I've been using this little snippet to select random images. However I would like to change it to select only images of a certain size. I'm running into trouble checking against image size. If I use get_image_dimensions() I need to use a conditional statement, which then requires that I allow exceptions. So, I guess I need some pointers on just limiting by image dimensions. Thanks.

import os
import random
import posixpath
from django import template
from django.conf import settings

register = template.Library()

def is_image_file(filename):
    """Does `filename` appear to be an image file?"""
    img_types = [".jpg", ".jpeg", ".png", ".gif"]
    ext = os.path.splitext(filename)[1]
    return ext in img_types

@register.simple_tag
def random_image(path):
    """
    Select a random image file from the provided directory
    and return its href. `path` should be relative to MEDIA_ROOT.

    Usage:  <img src='{% random_image "images/whatever/" %}'>
    """
    fullpath = os.path.join(settings.MEDIA_ROOT, path)
    filenames = [f for f in os.listdir(fullpath) if is_image_file(f)]
    pick = random.choice(filenames)
    return posixpath.join(settings.MEDIA_URL, path, pick)