Ive schrieb:
> POV-Ray supports only a (particular small) subset of possible 
> TIF-formats and IIRC there was a change between libtif 3.6 and 3.8 
> regarding alpha channels and the recommended way the tag 
> 'TIFFTAG_EXTRASAMPLES' should be interpreted.

That must then be why POV-Ray 3.6.2 handles those TIFF files properly 
while 3.7 does not.

> In fact TIFF support is 'broken' in so many ways that I would drop it 
> completely. I can estimate how much time is needed to write some 
> reliable TIF importer and I think this time would be better spend for 
> the more important things within POV-Ray.

I think retaining support for the most basic TIFF files won't hurt, and 
in that case it would appear rather odd for POV-Ray 3.7 to support less 
variants of TIFF than 3.6.2.

Anyway, I got the libtiff 3.8.2 running with POV-Ray 3.7 now, and will 
submit the changes to the repository any minute.

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