This post shows three examples of full spectrum mapping methods for multispectral photography. I’ve used some quick shots I took inbetween rain clouds so I apologise for the poor quality – especially the infrared image. All shots taken on a converted D70.
|Infrared (720nm filter)||Visible light (Hoya cut filter)||Ultraviolet (Baader-U filter)|
The only map I see often is the classic 3to3 map. The characteristics are so that vegetation stands out in a very prominent red, nectar guides are clear cut and clear skies are a strong blue. The next map is weighted, roughly, 5to3 on the proportional spectrum each [I,R,G,B,U] component covers as wavelengths. The output shows the nectar guide enough for it to be noticeable, but clearly less so. The last map is my favourite so far, it is a 5to3 map that distributes the [I,R,G,B,U] in equal proportions. It dulls the bright red vegetation caused by infrared in the red channel and shows the nectar guide a little better than the previous map.