What you are saying does never apply when using content for personal use. When I buy a DVD I am allowed to watch it with a filter or watch only every second frame. This would never violate your copyright.
When you buy a painting, the artist may forbid you from changing it.
Why do you believe that can't be the case for a movie? Just because it is technically possible to modify only copy does not make it obvious that you should be entitled to it.
Note that I'm not asserting that this actually is the case. I'm mostly asserting it's not obviously not the case.
Because in my example I don't even have to modify the movie. I can apply the filter while it's playing.
And besides that your examples require the presence of a contract between me and the architect/painter where I resign from my rights to change the object. Copyright has nothing to do with it.
Originals will always have inherent differences from copies in people's minds.