Holographic image display systems

The present invention relates to a holographic image display system, and a related method, and a processor control code. A method is provided for displaying an image holographically, the method comprising: inputting display image data defining the image for display; Processing the image data to determine first image data representing a first spatial frequency portion of the image data and second image data representing a second spatial frequency portion of the image data, wherein the second spatial frequency Is higher than the first spatial frequency; Displaying a hologram of said first image data on a spatial light modulator (SLM) to form an intermediate real image generated holographically; And modulating the intermediate real image using the second image data to display the image.