Rear Projection: Cinematography Secrets
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Rear projection used to be a common technique for compositing actors into different environments. By projecting an image onto a screen from behind, and then shooting the actor against that backdrop, you could create the illusion of the actor being somewhere else. Today we mostly use green screens for this type of work, with the green backdrop being replaced in post production with an image or video. However, rear projection can still be a useful technique for independent filmmakers and people who prefer practical effects. Today on 4 Minute Film School, we’re going to show you how to put together a rear projection setup on your next project.
In this video, Matt from the A-Team shows us how to set up a rear projection and light the set for your scene. First, he figures out where the camera needs to be placed for the shot. This will let him know where the rear projection needs to go if he’s working in a limited space. Second, he picks a background for the rear projection, keeping in mind the perspective of the camera versus the perspective of the projected image. Lastly, he uses lighting to balance the exposure of the projection and the lighting on the set.
The main aspects addressed in this video are matching the camera’s perspective, matching the lighting, and balancing exposure. Matching the camera’s perspective means making sure the image you’re projecting looks like it was taken from the same angle. This means camera height and pan or tilt. Matching the lighting refers to using lights on your set to replicate what the light is doing in your projected image. Matching the light quality, color, and direction will make your shot more believable. Balancing exposure means adjusting the brightness of your lights on set and the brightness of the projector to make sure it doesn’t look too artificial.
Overall, rear projection can be a fun tool to use on set when you can’t be in the physical location. Whether it’s done to save time in post production, or add some realism to your scene, there are lots and lots of creative opportunities you can have with rear projection. A version of rear projection is even being used on bigger productions to show the real-time effects of a background image instead of a green screen. On your next project, think about how you could use rear projection to enhance your story.
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