How to view pictures by registration?

Question

WordPress

Good day.
How to view pictures for certain categories by registration, that is, a user who is not registered on the site could only look at the text itself but with a blurred picture
Like this:
https://sweet-smoke.moscow/shop/tabak-DarkSide

Answer 1

with blurred picture

In fact, there is not a blur, but a very small picture, stretched to a large size.

viewing pictures by registration

if(user registered){
send headers like picture;
echo readfile (full path to the image on the server);
}

Answer 2

1. We determine that the category / product is protected, i.e. cannot be viewed without some additional action.
2. Check if the user has access to a protected category/product.
3. If not, then we blur the image, otherwise we show it.
And how to implement it more specifically is up to you.