global_settings {
 assumed_gamma 2.4 //default 2.2, a lower value is brighter, higher
darker
 ambient_light <.9,.9,.9> //or just 0.9, lower darkens, higher lightens
 }

Not so sure you can keep contrast adjusted too well either way though,
adjusting 'diffuse' lower is a way to raise or lower the contrast when
specular highlights are changed along with it too (sounds like in your
case). It varies, but you'll most likely need to do a shifting of all
these based upon your desired output.
You mention 'radiosity', are you actually using radiosity?
Unfortunately there is no global diffuse, might make for a good addition
to the program.

M J Smith wrote:
> 
> What radiosity routines are included in POV? I would like to render a scene
> that has low lightly with very little specular reflection. I know I could add
> an ambient light term, but seems to have the effect of changing the
> "contrast".
> 
> Cheers
> 
> Mike

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