Many devices now allow you to create 3d photos using either 2 cameras or 2 images taken a short distance apart. Mostly these images are saved as mpo files which require special hardware (such as a Nintendo 3DS) to show them correctly. To show them
on regular screens - you'll need a pair of those Red-Blue 3D glasses - I've put together a small script to produce an anaglyph image image from an mpo file. You can see a couple of these images created using this script below:
If you're interested in the technical details or getting hold of source code head in over to the projects github page.