1. A method to generate a reproduced image in a dual modulator display system, said system comprising a processor, a front modulator, a back modulator comprising a set of backlight elements, wherein said backlight elements comprising at least a first light source and a second light source and further wherein the front modulator and the backlight elements are independently controllable by the processor in response to input image data received by the display system, the method comprising: receiving input image data that specifies that a color element of the front modulator is to receive a first colored illuminant from the first light source and a second colored illuminant from the second light source of the back modulator; detecting a boundary between groups of other color elements configured to generate reproduced image portions with different colors; predicting the appearance of the image as might be reproduced by the display system; and when the predicted appearance at a detected boundary comprises mismatch attributes, modifying at least one of the first colored illuminant and the second colored illuminant under control of the processor according to input image data to adjust the one or more color characteristics into a range of values associated with a portion of an image that corresponds to the portion of the reproduced image.