Lazy loading for images

[stefan6419846]

Explanation

Loading images should be done lazily in the ImageFile class instead of on creating the ImageFile class. Relevant derivable values (width, height and data size) should be queried from the stream header without reading the actual stream to allow users to impose limits on which image streams should be loaded.

Code Example

from pypdf import PdfReader

reader = PdfReader("file.pdf")
for page in reader.pages:
    for name in page.images.keys():
        image = page.images[name]
        if image.width > 5000 or image.data_size > 1_000_000:
            continue
        image.image.save(name)