Kari Kivisalo wrote:
> 
> I haven't found a single program that can read those pngs and convert
> them to raw or 48bit tiff for Photoshop and Matlab. Even some converter
> program from the png group reported them as invalid.
> 

But libpng obviously supports them (otherwise Povray could not write
them).  As the Delphi component i use for reading and writing png's works
fine with grayscale 16 bit i suppose it also works with 48 bit:

http://www.geocities.com/SiliconValley/Network/2114/

It should not be very difficult to write a conversion program, but it
would be better to directly write it with Povray, IIRC Povray 3.5 will add
tiff output.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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