This infrared aerial photo of Hornby Bend was taken by Dick Richardson at an altitude of 4500 feet in November 1998.
Chlorophyll absorbs light in the long, visible red band and fluoresces it in the near infrared band.
In the photo, the darker, more pure the red is, the more chlorophyll we are seeing. Another absorbs blue and green and another absorbs blue. Thus we have red, green, blue colors. In using CIR film, we put a filter in that blocks out blue, and shorter wave length, and let the rest come through.