Bug 128212

Summary:	Add LZW compression support
Product:	[Fedora] Fedora	Reporter:	Sven Neuhaus <sven-redhat>
Component:	libtiff	Assignee:	Matthias Clasen <mclasen>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2	CC:	redhat-bugzilla
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-12-22 19:54:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

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You looked at an outdated version of the webpage.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.