1. Reseau grid apparatus for providing grid marks for an image on an object to be photographed or digitized by a camera, comprising: an object mounting plate for supporting the object; reseau means for holding the object on the mounting plate and for providing reseau grid marks correlated geometrically with the image, said reseau means including a thin transparent reseau plate adapted for positioning on the object mounting plate and having two opposite planar surfaces with edges around its perimeter, a plurality of grid marks in the form of grooves etched on one of the surfaces of the reseau plate, and grid illumination means positioned adjacent an edge of the reseau plate for illuminating the grid marks by directing light longitudinally through said reseau plate from the edge of the reseau plate to the grooves in the surface of the reseau plate; an object illumination means adjacent said object mounting plate for illuminating the image on an object positioned on the object mounting plate.