These discussions always kind of leave me completely confused, because I'm not at all a visual reader. I can't "see" characters at all unless they're really explicitly described or, better yet, if there's an illustration somewhere.

This isn't a "lol, I'm colorblind," thing, more a whole...not getting the whole idea of having such a strong image of a character that you get upset to that degree when a movie depiction doesn't match.

By contrast, I'm quite prone to Fan Casting; I was delighted to learn that William Gibson had patterned Molly Millions in Neuromancer after Chrissie Hynde, because of how warm I'd gotten--Joan Jett having firmly installed herself as my own mental image.