A method of displaying color data on an electronic paper display is displayed. The method comprises providing an electronic paper display having display pixels at a display pixel pitch and providing a color filter for said display. Said color filter comprises groups of colored filter elements, each said colored filter element having one of a plurality of different colors, wherein each group of colored filter elements defines a pattern of said colored filter elements. In said pattern a colored filter element overlies an integral number, n, of said display pixels, where n is two or more. The method also comprises providing color image data defining a plurality of color image planes, one for each of said different colors. Data in a said color image plane comprises image pixel data defining values for image pixels corresponding to said display pixels. The method also comprises selecting, from said data in each said color image plane, data for image pixels corresponding to display pixels over which the filter elements of the respective color for the color plane lie; and using said selected data to drive said electronic paper display; wherein on said display a rate of spatial variation of said selected data for said image pixels is less than said display pixel pitch.