1. A system comprising: a memory adapted to receive a visible spectrum image of a scene and an infrared image of the scene; and a processor in communication with the memory and configured to: receive control parameters, derive color characteristics of the scene from at least one of the images, derive high spatial frequency content from at least one of the images, and generate a combined image comprising relative contributions of the color characteristics and the high spatial frequency content, wherein the relative contributions are determined by the control parameters.