What are the differences between "Movie Snape"'s and "Book Snape"'s personality?

That's a প্রশ্ন to be asked to Alan Rickman - actually I'd like to hear his answer. Because there are noticeable differences indeed.

Book!Severus is much আরো emotional than movie!Severus in my opinion. Except in his memories in the last movie. I think Alan chose to play him like that to make a strong contrast between a very self-controled individual and the basket case he was when Lily died অথবা the man shocked দ্বারা the fact that Lily's son had to die in the end.

I saw a vid in which Alan explained he played Severus according to the book, stating that for example, he never raises his voice. So he played him like that. He's an actor that plays a lot with his voice (see his other movies, it's incredible).

As for his "brutality", I think he vented his pent-up emotions that way, especially on Ron and Harry in movie!GoF, but honestly they deserved it ! Three times they chatted, he got pissed off, like any teacher would.

Same thing in movie!OotP, when he smacked Ron with his book, but this time the private man he was had been really pissed off দ্বারা Umbridge who tactlessly asked personal প্রশ্ন in front of the students, stuff they didn't have to know (plus it can undermine a teacher's authority).

Severus was brutal with Harry in movie!OotP during the Occlumency lessons because there was so much anger between them. Harry had the knack to bring back alive some painful memories in Severus. It's a miracle Severus never killed him. But this miracle can be attributed to Lily. Check every time Severus looked at Harry : he stopped for an instant, most likely thinking "Lily's eyes !" অথবা "He's got his mother's eyes" (to make a quote), before seeing James again and treat Harry harshly.

A last point : in some institutions, it was deemed acceptable that teachers exert punishment on students that way.

Movie Snape did not have enough screen time, there was no time to প্রদর্শনী the 'meanier and nastier' parts of him. He is definitely meanier and আরো petty in the books, especially when it comes to Harry,Neville and Hermione. Movie Snape seems to be আরো mysterious as we don't get to see him in every দিন Hogwarts life as we do in the books.

Book!Snape was an asshole to thwart all assholes before him.

Movie!Snape was a strict teacher with a troubled past and never made it farther than that. I've had teachers worse than him, amusingly enough.

The difference is immense, but it is hard to describe...

I think Alan Rickman gave Snape not only a face, he gave him a heart. How he acted and reacted. How he looked, thats one of the things that makes him so adorable. He can only look at someone (or in the camera) and this moment has such an effect on me...unbelievable. His voice is authority itself. He must not be loud অথবা say a lot.
Alan Rickman was right: J. Rowling gave 'helpful' informations, like I see in his voice for example. But I think, she has not প্রদত্ত away too much of Snape. And that's what I've missed with the book-Snape. I wasn't sure whether to like অথবা dislike him. Alan Rickmans Snape is very, very different from that.