An image processing method and system for mitigating the effects of show-through in scanning multiple two-sided documents during book scanning applications in a scanning system. With the disclosed system and method: a scanned first side image P is derived from a first side image A of a duplexed document and a scanned second side image Q is derived from a second side image B of the duplexed document, where at least first side image P includes a component attributable to show-through from said second side of said document, and storing images P and Q; a scanned first side image R is then derived from a first side image C of a subsequent duplexed document and a scanned second side image S is derived from a second side image D of said subsequent duplexed document, and at least the first side image R included a component attributable to show-through from the second side of the subsequent document. Images R and S are stored, and from second side image Q, first side image R, and second side image S, a comprehensive representation is generated thereof corresponding to the show-through contribution of Q, R and S to first side image P. Image P is processed to remove show-through as a function of the representation Q, R and S, thereby deriving correct image A.