Abstract: Process and apparatus for printing a plurality of imposed pages in which proofs of said pages are manufactured, the proofs then being confined in co-planar, predetermined relation by engaging the sheets solely along selected edges thereof, and while holding the sheets thus confined manufacturing a printing plate or other reproductions therefrom. In one embodiment the proofs are on opaque or light impermeable sheets, while in a second embodiment they are on light permeable sheets. In the case of the opaque proofs used to make a printing plate, the plate is produced from a photo negative of the proof, whereas if the proofs are on light permeable material a plate may be produced directly by passing light through said proofs onto the sensitized surface of the plate material.