Account for invalid image files

[AnthonyN3]

Info

Currently the program assumes the image files are all valid and as of now if it gets a invalid image file it doesn't fail smoothly.

ToDo: Figure out how to handle this issue.

Brainstorming Possible Solution(s)

1. Verify all the images before starting the slide show (using something like PIL.Image.verify)
2. Handle when you get to the invalid image and either discard the image and continue
3. Show "Error can't open {image name here}" text on screen when it gets to that image

Solution (1)

something like this could work

from PIL import Image
import os

def is_valid_image(path):
    try:
        with Image.open(path) as img:
            img.verify()  # Verify integrity without fully decoding
        return True
    except Exception:
        return False

def get_valid_images_in_folder(folder_path):
    valid_images = []
    for filename in os.listdir(folder_path):
        path = os.path.join(folder_path, filename)
        if os.path.isfile(path) and is_valid_image(path):
            valid_images.append(path)
    return valid_images

OR to take it one step further to make it more efficient(especially if there are LOTS of images to verify). We can use multi threading like:

from PIL import Image
import os
from concurrent.futures import ThreadPoolExecutor, as_completed

def is_valid_image(path):
    try:
        with Image.open(path) as img:
            img.verify()
        return path  # Return path if valid
    except Exception:
        return None  # Return None if invalid

def get_valid_images_in_folder(folder_path, max_workers=8):
    image_paths = [
        os.path.join(folder_path, f)
        for f in os.listdir(folder_path)
        if os.path.isfile(os.path.join(folder_path, f))
    ]

    valid_images = []
    with ThreadPoolExecutor(max_workers=max_workers) as executor:
        future_to_path = {executor.submit(is_valid_image, path): path for path in image_paths}
        for future in as_completed(future_to_path):
            result = future.result()
            if result:
                valid_images.append(result)

    return valid_images