True or False?
A digital image recorded by a digital camera is displayed on a
computer screen very logically, that is the display systems
red channel is associated with the cameras red channel, its
green channel with the cameras green channel, and so on. The
resulting image is thus a faithful copy of what the direct observers
eye would have seen: a red-coloured object is shown in red, etc.
We have seen that in remote sensing systems it is possible to detect
and record parts of the electromagnetic spectrum that cannot be
detected by the naked eye, for example, the infrared band. To visualise
this information we pair up display colours (red-green-blue) with
spectral bands in the observation system that do not necessary correspond
to them. In so doing, we create coloured composites that are sometimes
called false colour images.