George Lucas has hit out at directors using technology to resurrect dead film stars like Marilyn Monroe.
The Star Wars creator expressed concerned about the development of computer imaging technology enabling Hollywood studios to create virtual movie idols.
Studios can now scan in thousands of images of a particular actor, using different expressions and angles to make a composite of their face.
Lucas admitted that it is impossible to stop the march of technology, but said that film audiences would not want to see a virtual reality version of a dead star.
He explained that the technology has already been used in stunts and more difficult scenes, and was deployed extensively in the film Gladiators when Oliver Reed died before filming was finished.
"But if you bring back Marilyn Monroe, what you would have is a caricature," Lucas told news website Ananova.
"You could do it, but you can't get a perfect actor. Acting is a human endeavour and the amount of talent and craft that goes into it is massive, and can a composite reproduce that?"
He said that voices would have to dubbed and suggested that the result would be a cartoon character rather than representing the depth of the original human being.
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