Trevor Quayle wrote:
>
> explain how it would apply to a small object against a dark background?

You just look at the object surface and ignore the rest. One mesure
of brightness (pixel values) could be W/m^2. It doesn't change
when the size (area) of the object changes. A big object which emits
100 W/m^2 is as bright as a small object which emits 100 W/m^2.
The total energy emitted changes but not the energy/area (brightness).
This is all seen from a fixed camera distance of course.


_____________
Kari Kivisalo

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