2011.06.15 05:22 "Re: [Tiff] bug in G4 encoder.", by Lee Howard
there is a bug in the G4 encoder. attached to this email you find a file "gimpcrop.g3.tiff". it is a correct TIFF file encoded with G3. you can open it with the usual viewers.
now do this:
tiffcp -c g4 gimpcrop.g3.tiff out.tiff
the file gets converted from G3 to G4. the following command shows that the output file is corrupted.
tiffcp out.tiff lala.tiff
I cannot reproduce your problem with 4.0.0beta6.