>   sqrt(pi * A) / pi

A is the emitter area, right?
Can you tell me about the origin of this formula?


> To simulate photograph dynamic range compression I think that Gamma should
> be ln(0.5)/ln(0.18) because gray card which reflects 18% of light looks
> half bright.

Ehmm... can you explain more about this?

thx, sorry for boring questions.

         Manuel

Post a reply to this message