My green-magenta triscopics, turned backwards, do a modest job viewing this also. It's a well-done image. Since I wasn't taught 3D in school, I'm teaching myself. I'd like to experiment with luminosity-based anaglyphs, if those are even possible.
You take 2 pictures one from the left and one to the right (about 1 inch or 2) line them up in Photoshop on the focal point take the top (left) layer and remove the blue and green colours in the levels adjustment take the lower (right) layer and remove the red colour in the levels adjustment set the top layer to screen