1. A method of scanning and individually detecting a number of images on a scanner, the method performing the following steps for a plurality of scanlines: detecting and grouping together one or more consecutive pixels of a current scanline, wherein the pixels are grouped together based on a representation of said current scanline; determining a current background colour of the scanner, wherein the current background colour is derived from a previously said determined background colour and a colour representative of that group of pixels of the current scanline most likely to be part of the background; determining those said groups of pixel of a current scanline that are likely to belong to said images and those that are likely to belong to the background based upon said determined current background colour, and copying said determined groups of pixels belonging to images of a current scanline to their respective images.