Bug 128212 - Add LZW compression support
Summary: Add LZW compression support
Alias: None
Product: Fedora
Classification: Fedora
Component: libtiff (Show other bugs)
(Show other bugs)
Version: 2
Hardware: All Linux
Target Milestone: ---
Assignee: Matthias Clasen
QA Contact:
Keywords: FutureFeature
Depends On:
TreeView+ depends on / blocked
Reported: 2004-07-20 08:28 UTC by Sven Neuhaus
Modified: 2007-11-30 22:10 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2004-12-22 19:54:33 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Sven Neuhaus 2004-07-20 08:28:18 UTC
libtiff comes without LZW compression support.
The Unisys patent on LZW has now expired everywhere. It can be added
back in.

I can provide a spec file that builds libtiff with LZW compression
(using the libtiff-lzw-compression-kit-1.5.tar.gz package) if necessary.

Comment 1 Matthias Clasen 2004-08-30 13:51:05 UTC
The libtiff website contains the following comment on lzw compression:

It appears that Unisys is actively pursuing copyright control on the
LZW compression algorithm. In particular, users of the LZW compression
within the TIFF framework. For this reason the TIFF 6.0 spec states
that LZW compression is not recommended. It is unclear at this time
what compression algorithm will be used in place of it. I have no idea
what this means to you or to this library. I make no warranty or
guarantees with regard to the LZW support in this library.

Comment 2 Sven Neuhaus 2004-08-31 08:28:43 UTC
You looked at an outdated version of the webpage.
The mirrored page at http://www.libtiff.org/misc.html is dated
2003/12/23 10:28:17, 
the authorative page at http://www.remotesensing.org/libtiff/misc.html
is dated 2004/08/11 05:11:25 and no longer carries this notice.

Please reconsider.

Comment 3 Robert Scheck 2004-12-22 11:52:05 UTC
Sven, if we would upgrade libtiff to 3.7.1, lzw support is a) delivered
directly with libtiff and b) could be also enabled; see bug #143560.

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