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<HTML>
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<HEAD>
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<TITLE>
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Changes in TIFF v3.5.3
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</TITLE>
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</HEAD>
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<BODY BGCOLOR=white>
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<FONT FACE="Arial, Helvetica, Sans">
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<FONT FACE="Arial, Helvetica, Sans">
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<BASEFONT SIZE=4>
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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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<BASEFONT SIZE=3>
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<UL>
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<HR SIZE=4 WIDTH=65% ALIGN=left>
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<B>Current Version</B>: v3.5.3<BR>
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<B>Previous Version</B>: <A HREF=v3.5.2.html>v3.5.2</a><BR>
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<B>Master FTP Site</B>: <A HREF="ftp://ftp.onshore.com/pub/libtiff">ftp.onshore.com</a>, directory pub/libtiff</A><BR>
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<B>Master HTTP Site</B>: <A HREF="http://www.remotesensing.org/libtiff/">http://www.remotesensing.org/libtiff</a>
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<HR SIZE=4 WIDTH=65% ALIGN=left>
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</UL>
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<P>
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This document describes the changes made to the software between the
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<I>previous</I> and <I>current</I> versions (see above).
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If you don't find something listed here, then it was not done in this
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timeframe, or it was not considered important enough to be mentioned.
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The following information is located here:
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<UL>
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<LI><A HREF="#configure">Changes in the software configuration</A>
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<LI><A HREF="#libtiff">Changes in libtiff</A>
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<LI><A HREF="#tools">Changes in the tools</A>
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</UL>
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<p>
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The ChangeLog will follow, but please note the most important change:
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LZW compression has been removed.
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<p>
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Unisys has the patent on LZW compression and have been very active in
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their enforcement of late, demanding payments of $5000 or more from
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websites using unlicensed software to create GIF's. They could well
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do the same do persons using libtiff to create LZW compressed TIFF
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images.
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<p>
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From <A HREF=http://burnallgifs.org>Burn All GIF's Day</a>:
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<br>
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<em>The catch is that it appears to be difficult or impossible to get a
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Unisys license to use LZW in free software that complies with the Open
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Source Definition</em>
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<P>
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Unfortunatly, the removal of LZW compression means that saved image size has
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grown dramatically. Without a change in the TIFF spec to support
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another lossless compression format, this is unavoidable.
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<P>
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The library can use zip for lossless compression, but as this is not
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part of the spec, TIFFs using zip compression may not work with other
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software
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<P>
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We will be making a patch available that will contain the LZW
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compression code for users who have either obtained a license from
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Unisys or are willing to risk it.
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<p>
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LZW decompression is unchanged.
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<p>
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<P><HR WIDTH=65% ALIGN=left>
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<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
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<UL>
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<LI> Added zip creation to release makefile target
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</UL>
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<P><HR WIDTH=65% ALIGN=left>
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<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A>
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<UL>
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<LI> Added html for TIFFWriteTile.3t man page.
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<LI> Added some changes to tif_write.c to support rewriting existing
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fixed sized tiles and strips. Code mods disabled by default, only
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enabled if REWRITE_HACK is defined for now.
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<LI> Added TIFFWriteTile.3t man page.
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<LI> Added notes on use of makefile.vc in build.html, and fixed
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email subscription address.
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<LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c
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<LI> Did some casts cleaning up to reduce compiler warnings in tif_fax3.c,
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from Bruce Carmeron <cameron@petris.com> -- modifications of
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changes made by Frank (sun cc still complained on cast).
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<LI> fixed various VC++ warnings as suggested by Gilles Vollant
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<info@winimage.com>.
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<LI> Modified TIFFquery.3t man pages info on TIFFIsByteSwapped() to
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not imply applications are responsible for image data swapping.
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<LI> HTML-ized the man pages, added to html/man
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<LI> Removed LZW Compression to comply with Unisys patent extortion.
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<LI> Corrected one remaining 16 -> 32 bit value in tif_fax3.c,
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From Ivo Penzar <ivo.penzar@infolink-software.com.
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<LI> Added patch from Ivo Penzar to have TiffAdvanceDirectory handle
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memory mapped files. <ivo.penzar@infolink-software.com>
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</UL>
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<P><HR WIDTH=65% ALIGN=left>
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<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A>
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<UL>
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<LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c
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</UL>
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<A HREF="index.html"><IMG SRC="images/back.gif"></A> TIFF home page.<BR>
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<HR>
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Last updated $Date: 2004/11/26 14:37:20 $.
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</BODY>
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</HTML>
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