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The type of film or sensor in a camera has a dramatic effect on the way that incident light is transformed into colors in an image. In pbrt, the Film class models the sensing device in the simulated camera. After the radiance is found for each camera ray, the Film implementation determines the sample’s contribution to the pixel around the point on the film plane where the camera ray began and updates its representation of the image. When the main rendering loop exits, the Film writes the final image to file.