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1 <HTML> |
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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> |