Deny img file?

Question

Images

Hello! I want to prohibit access to the image, that is, when you open the image, an error was displayed, and this image was read successfully and without errors.

Answer 1

It is not very clear what it is about, I will assume that it is about the site.
As I understand it, you need the images to be available when viewed from the site, but not available via a direct link. Then you have two options:
1 - When submitting an image, check the referer, it must match the page of the site where the image is located
2 - Generate unique one-time links for images

Answer 2

If you are talking about hotlinking, then look for it on search engines.
For those who are particularly stubborn, you can insert a time bomb. Instead of a picture with a cat, give Sasha gray.