Hollywood 'craves digital versions of actors'
26 March 2013 Last updated at 08:37 GMT
Hollywood sometimes finds close-ups difficult to do during dangerous stunt scenes because the person carrying out the stunt is not the film star but a stunt man.
Digital CGI has gone a long way to creating believable images of characters but still finds difficulty replicating the complexities of the human face. Marc Istook finds out how accurate digital copies can be.