1. A computer program product, encoded on a computer-readable medium, operable to cause data processing apparatus to perform operations comprising: accessing a digital image have associated tonal data, including tonal data in an extended range beyond a normalized value of 1.0; instantiating an instance of an extended range curve tool corresponding to the digital image that includes a curve defining a relationship between input tonal values and output tonal values, wherein at least a portion of the input tonal values and output tonal values are associated with the extended range; generating an extended range histogram based on the tonal data associated with the digital image, the extended range histogram including data corresponding to the extended range; and presenting the extended range histogram in conjunction with the instance of the extended range curve tool.