"Kari Kivisalo" <ray### [at] engineercom> wrote in message
news:3BD5A384.940229DF@engineer.com...
> 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.

I actually meant the same sized object at varying distances, I can see how
what you are saying works for varying object sizes.

-tgq


>
>
> _____________
> Kari Kivisalo

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