How important is it to have a clear image of the main protagonist in a crime fiction book?
When the book or series is filmed or goes on television if the star does not fit your mental image does it ruin the next books in the series for you?
Do actors, television and film producers have an obligation to get as close as possible to the author's character?
Lauren [in a comment] said that she thought in text and did not imagine the scenery or image of the characters. [Apologies if I have misquoted] I think in pictures and develop an image of what I think the character is like. For instance I found it impossible to watch John Hannah as Rebus, as he was almost the anti-Rebus as far as I was concerned.
Maxine of Petrona mentioned in our Friend Feed discussion group that although Kenneth Branagh acted well in the recent BBC Henning Mankell trilogy he was not the Wallander of the books. I have discussed this previously with regard to David Suchet going the extra mile to be the Hercule Poirot of the Agatha Christie book and the idiosyncratic casting of Stieg Larsson's Lisbeth Salander here and here.