>   "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)"
> and
>   "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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