Christopher James Huff wrote:

> raw_image filter restores the full float precision colors). Don't know 
> of any workaround for 3.5 though, you would have to use an external 
> program.

Wouldn't POV-Ray itself be able to read a 48 bits PNG ?

(you render in a 48 bits PNG, you use it as an image_map
  that fits exactly the screen, and you process it using
  eval_pigment and reconsturct the image with colored
  boxes)

Fabien.

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