AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2001.05.12 23:08 "TIFF/CCITT Group 4 Compression uses LZW??", by Wes Rishel
2001.05.13 09:23 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Andreas R. Kleinert
2001.05.13 14:54 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Frank Warmerdam

2001.05.13 09:23 "Re: TIFF/CCITT Group 4 Compression uses LZW??", by Andreas R. Kleinert

I am a bit surprised find that Group 4 compression would use LZW or be reliant on any patented algorithm. Does anyone know if that is, indeed the case? Or is it more likely that the error message is incorrect, perhaps triggered by the unknown field identified by tiffinfo?

Group4 has compression code 4, while LZW has code 5. Maybe some wrong check was applied somewhere.