Try a 'diffuse 1', or more, in the 'finish'; that way you retain shadows but
illuminate the background plane beyond the default, which is diffuse 0.6.
It's all in how the light source incidence angle affects an object.  For
instance, a sphere is always darker at the edges away from the light but if
the facing point were flat it wouldn't be darker until turned away again.
If you use 'ambient 1' instead it would remain the same color all over, even
in shadow, as long as diffuse is 0.  Raise diffuse and then the color
(potentially) won't be the same again.  This is why diffuse is probably your
best bet for getting the effect you want.
Sorry to say, Kari's example will tend to cause a artificial ambience.  Just
raise diffuse until you get the full 255 for each palette index information
as seen in a image processing program.

Bob H.

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