1. A scanning device comprising: a target bed; a monochrome imaging unit for capturing in a single image an entire document placed on the target bed; a light source for illuminating the entire document placed on the target bed, the light source include a plurality of individually selectable colors; a controller for controlling the light source to illuminate the entire document placed on the target bed sequentially in each of the plurality of individually selectable colors, the controller further controlling the imaging unit to capture in a single color plane image the entire document for each of the individually selectable colors, and processing the captured color plane images of the entire document to produce a full color duplicate of the entire document, wherein the controller accesses a color table with pixel intensities from the captured color plane images of the entire document as input values, the color table including corresponding color information needed to construct the full color duplicate of the document.