Wasn't it user who wrote:
>Hi all.
>
>Could enybody give me answer on my question?
>
>How I do in POV-Ray hightlight the shadows without increasing the 
>ambient_light?

You could reduce the contrast. One way to do that is to place a contrast 
reducing filter around the camera

#declare Camera_location = < whatever >;
#declare Contrast = 0.75;  // 1.0 = normal
#declare Brightness = 0.5; // 0.5 = normal

sphere {
    Camera_location, 0.01 hollow
    pigment {color rgb Brightness transmit Contrast}
    finish {ambient 0 diffuse 1}
}

// Basic idea swiped from Rune S. Johansen

-- 
Mike Williams
Gentleman of Leisure

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