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Changes in TIFF v3.5.3 | |
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<B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B> | |
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<B>Current Version</B>: v3.5.3<BR> | |
<B>Previous Version</B>: <A HREF=v3.5.2.html>v3.5.2</a><BR> | |
<B>Master FTP Site</B>: <A HREF="ftp://ftp.onshore.com/pub/libtiff">ftp.onshore.com</a>, directory pub/libtiff</A><BR> | |
<B>Master HTTP Site</B>: <A HREF="http://www.remotesensing.org/libtiff/">http://www.remotesensing.org/libtiff</a> | |
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This document describes the changes made to the software between the | |
<I>previous</I> and <I>current</I> versions (see above). | |
If you don't find something listed here, then it was not done in this | |
timeframe, or it was not considered important enough to be mentioned. | |
The following information is located here: | |
<UL> | |
<LI><A HREF="#configure">Changes in the software configuration</A> | |
<LI><A HREF="#libtiff">Changes in libtiff</A> | |
<LI><A HREF="#tools">Changes in the tools</A> | |
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<p> | |
The ChangeLog will follow, but please note the most important change: | |
LZW compression has been removed. | |
<p> | |
Unisys has the patent on LZW compression and have been very active in | |
their enforcement of late, demanding payments of $5000 or more from | |
websites using unlicensed software to create GIF's. They could well | |
do the same do persons using libtiff to create LZW compressed TIFF | |
images. | |
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From <A HREF=http://burnallgifs.org>Burn All GIF's Day</a>: | |
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<em>The catch is that it appears to be difficult or impossible to get a | |
Unisys license to use LZW in free software that complies with the Open | |
Source Definition</em> | |
<P> | |
Unfortunatly, the removal of LZW compression means that saved image size has | |
grown dramatically. Without a change in the TIFF spec to support | |
another lossless compression format, this is unavoidable. | |
<P> | |
The library can use zip for lossless compression, but as this is not | |
part of the spec, TIFFs using zip compression may not work with other | |
software | |
<P> | |
We will be making a patch available that will contain the LZW | |
compression code for users who have either obtained a license from | |
Unisys or are willing to risk it. | |
<p> | |
LZW decompression is unchanged. | |
<p> | |
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<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A> | |
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<LI> Added zip creation to release makefile target | |
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<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A> | |
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<LI> Added html for TIFFWriteTile.3t man page. | |
<LI> Added some changes to tif_write.c to support rewriting existing | |
fixed sized tiles and strips. Code mods disabled by default, only | |
enabled if REWRITE_HACK is defined for now. | |
<LI> Added TIFFWriteTile.3t man page. | |
<LI> Added notes on use of makefile.vc in build.html, and fixed | |
email subscription address. | |
<LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c | |
<LI> Did some casts cleaning up to reduce compiler warnings in tif_fax3.c, | |
from Bruce Carmeron <cameron@petris.com> -- modifications of | |
changes made by Frank (sun cc still complained on cast). | |
<LI> fixed various VC++ warnings as suggested by Gilles Vollant | |
<info@winimage.com>. | |
<LI> Modified TIFFquery.3t man pages info on TIFFIsByteSwapped() to | |
not imply applications are responsible for image data swapping. | |
<LI> HTML-ized the man pages, added to html/man | |
<LI> Removed LZW Compression to comply with Unisys patent extortion. | |
<LI> Corrected one remaining 16 -> 32 bit value in tif_fax3.c, | |
From Ivo Penzar <ivo.penzar@infolink-software.com. | |
<LI> Added patch from Ivo Penzar to have TiffAdvanceDirectory handle | |
memory mapped files. <ivo.penzar@infolink-software.com> | |
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<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A> | |
<UL> | |
<LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c | |
</UL> | |
<A HREF="index.html"><IMG SRC="images/back.gif"></A> TIFF home page.<BR> | |
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Last updated $Date: 2004/11/26 14:37:20 $. | |
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