1. A method for use in a controller for generating and transmitting a target image to a receiver, wherein the target image is facsimile encoded and includes target image lines comprising pixels, and the target image lines have a resolution, T, which is greater than a predetermined resolution, C, for which a runlength code book stored in the receiver is optimized, said method comprising the steps of: computing a number, S, of sub-images from an interleaving ratio, T/C; dis-assembling the target image into S sub-images comprising sub-image lines; and encoding each of the S sub-images into one of S facsimile sub-image messages using a runlength code book identical to the runlength code book stored in the receiver.