1. A method performed by one or more computers programmed to enhance images, the method comprising: receiving an image and a face region associated with the image; sampling pixels from the face region; generating, based on the sampled pixels, a face-region evaluation, comprising: identifying a skin tone portion in the face region; and performing the face-region evaluation only on the skin tone portion, wherein the face-region evaluation comprises: converting the sampled pixels in the identified skin tone portion to a normalized red-green color space; and calculating a mean color of the converted pixels; identifying a modification to the image based on the face-region evaluation, wherein the modification comprises: projecting the mean color onto a point of a focus-to-focus centerline of a predetermined skin tone region having a shortest distance in red-green color space to the calculated mean color; and adjusting the image so that the sampled pixels in the skin tone portion have a new mean in red-green color space equal to the point; and modifying the image in accordance with the identified modification.