Pixel Indexing Game Levels

[ladman]

I am trying to make a game for a school project and use pixel indexing to create the levels. I don't know very much about it, but want to implement it into our game. Does anyone know how to do this. I am making the levels in 3ds max 2011 and im going to render out the level as one large image. any help with this would be great i cant find anything on this on the web. Its going to be a 2d side scrolling game

[Disch]

Maybe this is a dumb question, but what is pixel indexing?

A google search didn't turn up much (this thread was the 3rd hit).