> "Brightness is the perceived intensity of light coming from the image
> itself, rather than any property of the portrayed scene. Brightness
> is sometimes defined as perceived luminance. (From Adelson, MIT)"
> "Lightness is the perceived reflectance of a surface. It represents
> the visual system's attempt to extract reflectance based on the
> luminances in the scene. (From Adelson, MIT)"
> So your implied assumption that Brightness and Lightness are
> exchangeable terms is simply wrong. You were quite unspecific where
> you want to exchange these terms and I cannot determine if the usage of
> "lightness" is correct or not. My guess is, that somebody put some
> thought in the choice of words and I wouldn't change it unless someone
> shows that the usage of "lightness" is wrong.
i did not assume anything one of the reply's said it was :)
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