AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

1999.11.30 22:23 "libtiff 3.5.3 release.", by Michael L. Welles
[...]
1999.12.01 14:08 "Re: libtiff 3.5.3 release.", by Bruce Cameron
1999.12.01 15:02 "Re: libtiff 3.5.3 release.", by Klaus Bartz
1999.12.01 16:17 "RE: libtiff 3.5.3 release.", by Peter Smith
1999.12.01 19:20 "Re: libtiff 3.5.3 release.", by Chris Hanson
[...]

1999.12.01 15:02 "Re: libtiff 3.5.3 release.", by Klaus Bartz

CCITT T.4 ( G3 ) and CCITT T.6 ( G4 ) are lossless, but only defined for images with 1 bit per pixel and are TIFF extensions. The only baseline losless compression format is PackBits ( also it has a private number for the TAG :-) ).

LZW was in TIFF Revision 5.0 a baseline compression format, in Revision 6.0 it is NOT because the patent problems ( it's a TIFF extension ).

Since 7 years there is no new Revision. Else there will be a new baseline losless compression format - may be deflate or Burrows-Wheeler ( that what compresses in bzip2 ).

Why not use deflate ( name it ZIP if you want) jet? It compress better than LZW.

Klaus

-- 
-------------------------------------------------------------------
Dr. Klaus Bartz                                     bartzkau@ina.de
COI GmbH / Abt. KOS3    Industriestr. 1-3    D-91072 Herzogenaurach
Tel: +49 (9132) 82-3433                        Fax: +49-9132-824959