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; searching, with computing circuitry, electronically stored images of one or more portions of the scene for an image portion corresponding to the portion of the first image and having a sharpness that is different than the sharpness of the portion of the first image; modifying, with computing circuitry, the sharpness at the location by replacing the portion of the first image with the corresponding image portion; capturing another image of the face of the viewer with an image-capture device; determining, with computing circuitry in response to the captured other image of the face of the viewer, whether the viewer is gazing at the location within the first image; and modifying again, with computing circuitry, the sharpness at the location by replacing the corresponding image portion with the portion of the first image in response to the computing circuitry determining that the viewer is no longer gazing at the location within the first image.