stbenge wrote:
> Hi,
> 
> Can anyone tell me if there is a way to achieve additive transparency 
> for images? I'd like to update my 'luminous bloom' file, since the 
> current version tends to bleed dark colors as well as light ones.
> 
> A media box works, but it is much too slow. I wish there was an 
> 'addition' pigment to complement the average pigment.
> 
> Sam

Try this:

   image_map {
     ...
     transmit all 0.5
   }

   finish {
     ambient 2.0
     refraction 2.0
   }

The "transmit 0.5" and "refraction 2.0" work together to give you 100% 
transmittance.  The remaining 50% (left over from the transmit) combines 
with "ambient 2.0" to give 100% illumination.

-Nathan

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