1. On a computing device, a method of processing image data, the method comprising: defining a contiguous area of ambiguous data in an image; determining a border surrounding the contiguous area; classifying the contiguous area as either dark or far based on a characteristic of one or more pixels of the border; and for the classified contiguous area, processing one or more pixels of the contiguous area differently if the contiguous area is classified as far than if the contiguous area is classified as dark.