1. A method of image scanning, comprising: scanning an object in a forward direction and capturing a first image of the object; scanning the object in a reverse direction and capturing a second image of the object; and combining the first image and the second image to produce a single image, where combining the first and second image includes alining the first and second images using a location of a first reference mark and a location of a second reference mark in a coordinate system relative to a starting position of the forward direction scan and a starting position of the reverse direction scan. where scanning the object in the forward direction includes using at least one light source emitting a characteristic first optical spectrum for illuminating the object, where scanning (he object In the reverse direction includes using at least one light source emitting a characteristic second optical spectrum for illuminating the object, where the characteristic second optical spectrum differs from the characteristic first optical spectrum, and where emitting the characteristic second optical spectrum includes using a second lamp that emits a characteristic second set of at least three peak intensities, where the characteristic second set differs from a characteristic first set of at least three peak intensities.