Several older films like Jaws are being rereleased in 3D. How do the studios convert the film from 2D to 3D? I thought 3D required filming with two cameras.
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To get native 3D you do indeed need two cameras. But, you can use computers to separate certain elements on the screen and apply a 3D depth effect to those elements. So, using Jaws as an example, an artist using a computer will draw a line around the shark in each frame of film and then set it to be closer to the viewer than the rest of the frame.
This process isn’t perfect. It might be hard to perfectly outline the item in question and it might look odd for that one object to pop out while the rest of the scene is flat. With more work and more money these problems can be resolved but it usually never looks as good as using native 3D.
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