1. A digital offset printing method for producing a composite image on a substrate, the image being made up of a first plurality number of component images, each being formed from a different layer of ink, the method comprising: providing a first component image on a first surface; transferring the first component image from the first surface to an intermediate transfer module; repeating said providing and transferring steps for further component images until a second plurality number, less then the first plurality number, of component images have been accumulated on the intermediate transfer module, transferring the accumulated component images from the intermediate transfer module to the substrate by applying a plurality of layers of ink, corresponding to the second plurality number of accumulated component images, to the substrate; repeating said steps until all of the first plurality number of component images have been transferred to the substrate.