[ptx] link update

[Pablo d'Angelo]

Kai-Uwe Behrmann schrieb:
> Hi,
> 
> We work for CinePaint on a HDR creation plug-in, which will soon bee 
> released and may be nice in cooperation with Hugin. Is Hugin ready for 
> 32-bit floats? Vigra should allow though.

Sure, nona supported that pretty much from the scratch. They should also
work from within hugin (meaning, one directly open 32 bit float images,
instead of using 8 bit one to set control points etc.).

Which algorithm/library do you use for the hdr creation?

ciao
  Pablo