How much mask...?

[Abraxus]

I think Mystery Men covered the subject of superhero recognition pretty well.  You add a pair of glasses, and there is NO way this person could be recognized, or even associated with his super alter-ego.  It is just impossible! ;-)

[Eoraptor]

I say, if it worked for clark kent for 75 years, why mess with a good thing?

[FatherXmas]

I've always found these to be enough to fool facial rec.

[Hobbes]

best one is in the superman movie when he goes into the photo booth to change...take the film that comes out with him...what about the negative in the booth???

There is probably no negative to get.

http://en.wikipedia.org/wiki/Instant_film
http://en.wikipedia.org/wiki/Instant_camera

[Inc42]

Addressing this issue was the best part of the Green Lantern movie.

"What, you think I would not recognize you because I cannot see your nose?"

[ricodah]

Depending on the person.  If it's some celebrity, a lot of mask.  If it's your everyday joe schmoe, likely not that much.