A method of processing image data representing a plurality of images, the method includes processing the image data for respective ones of the images in order to generate allocation data for each image, and on the basis of the allocation data, allocating an image a position in a template, the template includes a plurality of image windows, each window representing a template position; and on the basis of user input, generating selection data representing a user selected allocated image, and for an unselected allocated image, replacing that image with another image from the plurality of images.