> Who said the png reader supports 16 bit grayscale files? :-)
> 
> The only format where 16 bit data is currently supported for image maps in
> plain POV-Ray 3.5 is ascii PGM.
> 
Quoting POVRay-3.5 doc: (povray-3.50c/doc/html/povdoc_187.html)

> PNG format heightfields are usually stored in the form of a grayscale
> image with black corresponding to lower and white to higher parts of the
> height field. Because PNG files can store up to 16 bits in grayscale
> images they will be as smooth as TGA and PPM images. 

This is about height fields, so I thought it was just natural that 
it would also work for pigments. 

Wolfgang

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