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We didn’t film an actual phone during the 2 shooting days we had. Instead of taking the shots out, I made them in Blender by modeling a mockup mobile phone with a screen. The screen uses a node-based shader that breakdown any input image into it’s basic RGB components. Then it recreates it through a procedually generated brick texture that mimics the size of the RGB color switches on most LCD screens.
The outcome looks convincing enough for the film.
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For the short film ‘Umbra’ we had a couple shots of a cellphone screen.