Wasn't it Sven Littkowski who wrote:
>Greetings.
>
>Is there any way to define transparency of a gray-shade image_map as 
>follows: the blacker the more transparent, and the whiter the more visible?
>
>I want to add lights to a planet surface. The lights are a gray-shade PNG 
>file.

texture { 
  pigment_pattern {image_map {png "transmap.png" interpolate 2}}
  texture_map {
     [0 texture {pigment {rgbt <0,0,0,1>}}]
     [1 texture {lightsTexture}]
  }      
}

-- 
Mike Williams
Gentleman of Leisure

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