The Bristol Railway Archive

If you've got a pair of 3D glasses, the ones with a red filter in the left eye and a blue filter in the right eye (green or cyan in the right eye will probably also work) then hopefully you should get a black and white 3D image of the 13 Arches. It's best viewed on a plain background.

That's pretty impressive! The houses in the foreground really stand out. But how...? Did you have a stereoscopic camera in the 60s?

No it wasn't a stereoscopic camera!! I stumbled across this wiki article http://en.wikipedia.org/wiki/Anaglyph_image on the weekend whilst searching for something else. Basically you take two photos slightly apart horizontally. For the left image you remove the green and blue elements of the image and for the right image you remove the red element of the image, you then combine the two 'processed' images back together getting the overlap correct to give you the 3D effect. I tried it out by taking two photos of the back garden which turned out quite well. By chance two photo's of the 13 Arches happened to be at just about the right spacings. It's not quite perfect but it's not bad.