Antiques Roadshow (from Cleveland) had a seqment from Western Reserve Archives on Barnard and Gardner. It seems that Barnard "doctored" his Civil War scenes from color-blind negatives with lots of clouds (they didn't say how he did it, but it looked pretty good - Ansel would have been proud), and Gardner took pictures from different angles of scenes of dead soldiers labeling one view "Confederates" and another view "Union." He even moved the famous "Dead Confederate Sharpshooter" to different locations, and posed him with different firearms. And it wasn't even digital - Hee hee!