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| 2 | <HEAD>
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| 3 | <TITLE>
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| 4 | Changes in TIFF v3.5.3
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| 5 | </TITLE>
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| 6 | </HEAD>
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| 7 |
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| 8 | <BODY BGCOLOR=white>
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| 9 | <FONT FACE="Arial, Helvetica, Sans">
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| 10 | <FONT FACE="Arial, Helvetica, Sans">
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| 11 |
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| 12 | <BASEFONT SIZE=4>
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| 13 | <B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B>
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| 14 | <BASEFONT SIZE=3>
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| 15 |
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| 16 | <UL>
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| 17 | <HR SIZE=4 WIDTH=65% ALIGN=left>
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| 18 | <B>Current Version</B>: v3.5.3<BR>
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| 19 | <B>Previous Version</B>: <A HREF=v3.5.2.html>v3.5.2</a><BR>
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| 20 | <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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| 21 | <B>Master HTTP Site</B>: <A HREF="http://www.remotesensing.org/libtiff/">http://www.remotesensing.org/libtiff</a>
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| 22 | <HR SIZE=4 WIDTH=65% ALIGN=left>
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| 23 | </UL>
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| 24 |
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| 25 | <P>
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| 26 | This document describes the changes made to the software between the
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| 27 | <I>previous</I> and <I>current</I> versions (see above).
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| 28 | If you don't find something listed here, then it was not done in this
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| 29 | timeframe, or it was not considered important enough to be mentioned.
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| 30 | The following information is located here:
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| 31 | <UL>
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| 32 | <LI><A HREF="#configure">Changes in the software configuration</A>
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| 33 | <LI><A HREF="#libtiff">Changes in libtiff</A>
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| 34 | <LI><A HREF="#tools">Changes in the tools</A>
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| 35 | </UL>
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| 36 | <p>
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| 37 | The ChangeLog will follow, but please note the most important change:
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| 38 | LZW compression has been removed.
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| 39 | <p>
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| 40 | Unisys has the patent on LZW compression and have been very active in
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| 41 | their enforcement of late, demanding payments of $5000 or more from
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| 42 | websites using unlicensed software to create GIF's. They could well
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| 43 | do the same do persons using libtiff to create LZW compressed TIFF
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| 44 | images.
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| 45 | <p>
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| 46 | From <A HREF=http://burnallgifs.org>Burn All GIF's Day</a>:
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| 47 | <br>
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| 48 | <em>The catch is that it appears to be difficult or impossible to get a
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| 49 | Unisys license to use LZW in free software that complies with the Open
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| 50 | Source Definition</em>
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| 51 | <P>
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| 52 | Unfortunatly, the removal of LZW compression means that saved image size has
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| 53 | grown dramatically. Without a change in the TIFF spec to support
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| 54 | another lossless compression format, this is unavoidable.
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| 55 | <P>
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| 56 | The library can use zip for lossless compression, but as this is not
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| 57 | part of the spec, TIFFs using zip compression may not work with other
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| 58 | software
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| 59 | <P>
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| 60 | We will be making a patch available that will contain the LZW
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| 61 | compression code for users who have either obtained a license from
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| 62 | Unisys or are willing to risk it.
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| 63 | <p>
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| 64 | LZW decompression is unchanged.
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| 65 | <p>
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| 66 | <P><HR WIDTH=65% ALIGN=left>
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| 67 |
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| 68 | <A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
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| 69 |
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| 70 | <UL>
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| 71 | <LI> Added zip creation to release makefile target
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| 72 |
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| 73 |
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| 74 | </UL>
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| 75 |
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| 76 | <P><HR WIDTH=65% ALIGN=left>
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| 77 |
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| 78 | <A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A>
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| 79 |
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| 80 |
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| 81 | <UL>
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| 82 |
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| 83 | <LI> Added html for TIFFWriteTile.3t man page.
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| 84 |
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| 85 | <LI> Added some changes to tif_write.c to support rewriting existing
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| 86 | fixed sized tiles and strips. Code mods disabled by default, only
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| 87 | enabled if REWRITE_HACK is defined for now.
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| 88 |
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| 89 | <LI> Added TIFFWriteTile.3t man page.
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| 90 |
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| 91 | <LI> Added notes on use of makefile.vc in build.html, and fixed
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| 92 | email subscription address.
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| 93 |
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| 94 | <LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c
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| 95 |
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| 96 | <LI> Did some casts cleaning up to reduce compiler warnings in tif_fax3.c,
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| 97 | from Bruce Carmeron <cameron@petris.com> -- modifications of
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| 98 | changes made by Frank (sun cc still complained on cast).
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| 99 |
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| 100 | <LI> fixed various VC++ warnings as suggested by Gilles Vollant
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| 101 | <info@winimage.com>.
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| 102 |
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| 103 | <LI> Modified TIFFquery.3t man pages info on TIFFIsByteSwapped() to
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| 104 | not imply applications are responsible for image data swapping.
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| 105 |
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| 106 | <LI> HTML-ized the man pages, added to html/man
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| 107 |
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| 108 | <LI> Removed LZW Compression to comply with Unisys patent extortion.
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| 109 |
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| 110 | <LI> Corrected one remaining 16 -> 32 bit value in tif_fax3.c,
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| 111 | From Ivo Penzar <ivo.penzar@infolink-software.com.
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| 112 |
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| 113 | <LI> Added patch from Ivo Penzar to have TiffAdvanceDirectory handle
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| 114 | memory mapped files. <ivo.penzar@infolink-software.com>
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| 115 | </UL>
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| 116 |
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| 117 | <P><HR WIDTH=65% ALIGN=left>
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| 118 |
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| 119 | <A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A>
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| 120 |
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| 121 | <UL>
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| 122 | <LI> Fixed apocalypse-inducing y2k bug in contrib/ras/ras2tiff.c
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| 123 | </UL>
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| 124 |
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| 125 | <A HREF="index.html"><IMG SRC="images/back.gif"></A> TIFF home page.<BR>
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| 126 |
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| 127 | <HR>
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| 128 |
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| 129 | Last updated $Date: 2004/11/26 14:37:20 $.
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| 130 |
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| 131 | </BODY>
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| 132 | </HTML>
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