1. A method for rendering a mammography image, comprising: obtaining mammography image data for a patient and storing the mammography image data in a computer-readable electronic memory; generating a mapping that transforms the mammography image data to a predetermined output image data space to normalize the mammography image data for consistent rendering and display appearance in which each input data code value corresponds to an output image data value by: (a) estimating a relative amount of dense tissue from the mammography image data; (b) identifying at least a first control point that delineates breast tissue from non-tissue image content and a second control point that delineates a fatty tissue region from a dense tissue region; (c) allocating output image data values in the output image data space for the identified fatty and dense tissue content according to the estimated relative amount of dense tissue; and (d) mapping image data values to the allocated output image data values according to the first and second control points, wherein the mapping of the image data values to the allocated output image data values normalizes the mammography image data and provides consistent rendering and display appearance of the image data across a plurality of different displays; and rendering the mammography image data on a display according to the generated mapping.