On 26/11/2014 15:02, Thomas de Groot wrote:
> What is a pallet-based transparency? The term is unfamiliar to me.

Not surprised. I made it up.

 From the top of my head:
It is an index of colours used in the image. In Pov we can set the 
transparency and filter values in the image_map definition. Each entry 
in the index can be set to a transparency, individually. I think that 
pallet based images are limited to 8 bit images.
So in a cloud map each grey could have a different level of transparency.

rgb -> rgbft

-- 

Regards
     Stephen

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