what is the technique used for act as a double role in movies?

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November 20, 2006 2:48am CST
in movies actors / actress act as a double or triple roles. how it is taken?
3 responses
ezzrssi
@ezzrssi (11187)
• Italy
20 Nov 06
no idea
blueman
@blueman (16509)
• India
20 Nov 06
i think it is some very simple video effect. made with a mirror or some software.
ksharma
@ksharma (838)
• India
20 Nov 06
i also don't kno