You need more or less normed colours, but they are easy to get. Just primary red (RGB: 255,0,0) and a Cyan (RGB: 0,255,255). Everywhere you get filter gels you also get some in these colours. And they don't have to fit absolute perfectly. Your brain is used to see 3D, if it gets information that looks like a stereoskopic view it creates a steroskopic view. And anyhow these cheap filters are not physical perfect. But they are absolut sufficient.

And its not good to change the algorithm becaue with these colours you can create coloured steoroscopic images (all colours exept red).