1. A computer program product comprising one or more computer-readable media having computer-executable instructions for implementing, in a processing device associated with a display device that has a plurality of pixels each having a plurality of pixel sub-components, a method of processing image data in preparation for displaying an image on the display device such that the pixel sub-components represent different portions of the image and the image is rendered with a desired degree of luminance accuracy and a corresponding desired degree of color accuracy, wherein the method comprises the steps for: passing a signal in which the image data is encoded through a low-pass filter, the signal having a plurality of channels each representing a different color component of the image; and based on the filtered signal, generating a data structure in which data representing spatially different regions of the image data are mapped to individual pixel sub-components of a particular pixel rather than being mapped to the entire pixel.