[ptx] multiple tiffs + compression

[Bruno Postle]

> and the DEFLATE compression method, is it also concerned by this
> kind of legal problems ? I think any compression method could work
> well beacause the generated TIFFs are full of flat transparent
> areas ...

I guess that the ideal solution would be for hugin to query libtiff
and see what compression schemes are supported.

Libtiff can be built with or without deflate (zlib), lzw or
packbits compression.

-- 
Bruno