Please help me recall a movie I once saw!?

I've recently begun thinking about old series and movies that I once watched when I was younger. A few days ago, I recalled an old favorite, Magic Tree House, and also remembered a really great animated movie as I watched the anime movie adaptation. But for the life of me, I can only remember what happened vaguely in it but no title. It's killing me to not remember!

The movie was about a young boy who is super cautious and completely unsure of himself, and winds up in the library by some certain event. For some reason or another, this big wave of paint cones out of nowhere and suddenly turns him to a cartoon. The boy is forced to take a journey to find an exit to a wacky illustrated world, accompanied by actual 3 actual books that walk and talk. I can't recall much but I remember one was horror, one was adventure that looked like a pirate, but I really can't remember the third. He fights everything, from Mr Hyde, Moby Dick, and a huge book dragon.

I'd love to figure out the title so I can go back and watch it again.