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