That’s exactly what happened when Peter Jackson brought The Lord of the Rings to theaters from 2001 through 2003. It’s rare for an adaptation to end up even better than the source and even rarer when the source is comprised of some of the most influential and beloved novels of a generation.
I can even appreciate adaptations that make select changes to the source for the benefit of the final product ( Game of Thrones and Watchmen). I love when adaptations of great source material go word for word and it works ( Sin City), and I hate when the adaptation bears little resemblance to even the spirit of the original ( X-Men 3, I’m looking at you). As a lifelong self professed geek, I know my details, and I love my canon. When it comes to adaptations, I can be a very finicky consumer.
Blu-ray: The Lord of the Rings Extended Edition