1. A method of processing data defining a three-dimensional computer model of an object, view-independent texture data for the three-dimensional computer model, view-dependent image data for a plurality of images of the object, and data defining a respective viewing direction for each image in the three-dimensional space, to generate compressed view-dependent image data for the images, the method comprising processing each image by: defining at least some of the view-independent texture data and the view-dependent image data of the image in the same two-dimensional image space; subtracting the view-independent texture data and the view-dependent image data in the two-dimensional image space to generate data defining a difference image in the two-dimensional image space; and compression encoding the difference image data.