If a movie projector is out of focus and the images on the screen are blurry, which spatial frequencies are missing?

Question

Quizplus · Accepted Answer

High frequencies are missing when images are blurry because these frequencies represent the fine details and sharp edges in an image. Low frequencies, on the other hand, represent the general shape and areas of uniform color in an image, which remain visible even when the image is out of focus. Horizontal, vertical, and diagonal frequencies refer to the orientation of the spatial patterns, not their clarity or detail level.

If a Movie Projector Is Out of Focus and the Images