Rich,
Don't know if what you were thinking to remember was this, but it's how
cd/ft^2 relate to "Brightness Value" (BV) or the subject luminance
portion
of EV (the other half is the film Speed Value [SV]):
EV = BV + SV
BV = log(luminance in fL)/log(2)
fL = foot-Lamberts
to convert from Cd/ft^2 to fL, multiply the Cd/ft^2 by pi
This may be the missing piece of the math you were trying to recall.
- -- John
Hi John,
Your web page is very helpful. Thanks!
Cheers,
Rich Lahrson
tripspud@xxxxxxxxxxxx
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