1. A method, comprising: displaying a first image of a scene with a display screen; capturing an image of a face of a viewer with an image-capture device as the viewer gazes at a location within the first image, a portion of the first image at the location having a sharpness; determining, with computing circuitry, the location in response to the captured image of the face of the viewer; and modifying, with computing circuitry, the sharpness at the location by replacing the portion of the first image with a corresponding portion of a second image of the scene, the corresponding portion having a sharpness that is different than the sharpness of the portion.