Rian Johnson is an analog photography devotee. The director of Knives Out and The Last Jedi can often be spotted on set with a Leica M6 at his side, documenting production on film. But sometimes, it's still easier to reach for a phone. So Johnson started wondering if the photos from his iPhone could be made to look more like the grade he applies to his movies.

The result is Chromagraph Camera, a $13 iOS app that bypasses elements of Apple's image processing pipeline and applies the same look used on Johnson's movies. The app, made by Johnson and his longtime cinematographer, Steve Yedlin, is shockingly simple, with just a few primary settin …

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