Inspiration comes from many sources. For many filmmakers, the inspiration can come from the written word. Books — and in some cases, short stories — have been adapted into movies. This has been such a trend that bookstores have a section where they display books that have been made into movies, advising, "Read the book before you see the movie." People have debated which version is better. Which really is better? Is there even an answer to that question, as a general rule?

The thing that sparks these debates is that the books people choose to adapt are timeless and popular to a certain degree such as The Harry Potter series, Running with Scissors, The Green Mile, Secret Window, Atonement, and The Devil Wears Prada. A significant part of the population is familiar with these books, have read them (sometimes even multiple times), and hold opinions about the plot, characters, and much more.

Readers have formed images and ideas about how they see the book as a movie. Disappointment or excitement happens when the movie either matches or diverges from what they imagined. In discussions, they would voice their opinion on whether the book or the movie is better.

Is it fair to compare? After all, books and movies are different types of media. Everyone has their own imagination and has thought about how that scene is supposed to go, or what that character is supposed to look like. Not everybody will be pleased. Some things do get lost in the translation and transition from page to screen.

Comparison, while inevitable, is rather unfair at times. A fan will not be able to influence the actor, the director, or the animator. The only comparable things are theme and atmosphere. Did the movie capture what made the book interesting? Did the movie have the same tone and atmosphere as the book? If the answer is yes to both, then it's fair to say, in comparison, the book and movie are as good as each other.

When other aspects are brought in, however, comparisons become unfair and the question of which is better becomes unanswerable except by opinion and on a case-by-case basis. Look at Jurassic Park and Harry Potter and the Order of the Phoenix.

Jurassic Park is an excellent movie and an excellent book. It helped a lot that the book's author, Michael Crichton, co-wrote the screenplay and was willing to change things around to suit the film media. He made the action of the story move faster and gave the characters more depth and emphasis on a personality trait to create better tension on the screen.