The colour maps in the NXTCam are ranges of colours that it uses to track objects by matching them to what it’s seeing. To configure them, you can use a nice utility, NXTCamView that allows you to adjust these maps on your PC, but what if you’d prefer to do it all from your NXT? Well, now you can.
I never really understood the terse explanation in the original user guide and judging from questions emailed to me and on many forums, it seems I wasn’t the only one. I asked Mindsensors if they wouldn’t mind writing a reference guide and they did. The resulting guide is excellent and has a nice example of how the 48 byte colour map is built-up. There’s an NXC program you can download as well.
In the end it seems it’s fairly trivial, but then again, most things are once you know how they work. 20-20 hindsight and all that.