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<section id="changes-in-tiff-v3-6-0">
<h1>Changes in TIFF v3.6.0<a class="headerlink" href="#changes-in-tiff-v3-6-0" title="Permalink to this heading">¶</a></h1>
<table class="docutils align-default" id="id1">
<caption><span class="caption-text">References</span><a class="headerlink" href="#id1" title="Permalink to this table">¶</a></caption>
<tbody>
<tr class="row-odd"><td><p>Current Version</p></td>
<td><p>v3.6.0 (<a class="reference external" href="https://gitlab.com/libtiff/libtiff/-/tags/Release-v3-6-0">tag Release-v3-6-0</a>)</p></td>
</tr>
<tr class="row-even"><td><p>Previous Version</p></td>
<td><p><a class="reference internal" href="v3.5.7.html"><span class="doc">v3.5.7</span></a></p></td>
</tr>
<tr class="row-odd"><td><p>Master Download Site</p></td>
<td><p><a class="reference external" href="https://download.osgeo.org/libtiff/">https://download.osgeo.org/libtiff/</a></p></td>
</tr>
<tr class="row-even"><td><p>Master HTTP Site</p></td>
<td><p><a class="reference external" href="http://www.simplesystems.org/libtiff/">http://www.simplesystems.org/libtiff/</a></p></td>
</tr>
</tbody>
</table>
<p>This document describes the changes made to the software between the
<em>previous</em> and <em>current</em> 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:</p>
<section id="major-changes">
<h2>Major changes<a class="headerlink" href="#major-changes" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p>New utility <strong class="program">raw2tiff</strong> for converting raw rasters into TIFF files.</p></li>
<li><p>Lots of new <strong class="program">tiff2ps</strong> options.</p></li>
<li><p>Lots of new <strong class="program">fax2tiff</strong> options.</p></li>
<li><p>Lots of bug fixes for LZW, JPEG and OJPEG compression.</p></li>
</ul>
<section id="custom-tag-support">
<h3>Custom Tag Support<a class="headerlink" href="#custom-tag-support" title="Permalink to this heading">¶</a></h3>
<p>The approach to extending libtiff with custom tags has changed radically.
Previously, all internally supported TIFF tags had a place in the
private <code class="xref c c-struct docutils literal notranslate"><span class="pre">TIFFDirectory</span></code> structure within libtiff to hold the values (if read),
and a “field number” (ie. <code class="xref c c-macro docutils literal notranslate"><span class="pre">FIELD_SUBFILETYPE</span></code>) used to identify that tag.
However, every time a new tag was added to the core, the size of the
<code class="xref c c-struct docutils literal notranslate"><span class="pre">TIFFDirectory</span></code> structure would change, breaking any dynamically linked
software that used the private data structures.</p>
<p>Also, any tag not recognised
by libtiff would not be read and accessible to applications without some
fairly complicated work on the applications part to pre-register the tags
as exemplified by the support for “Geo”TIFF tags by libgeotiff layered on
libtiff.</p>
<p>Among other things this approach required the extension code
to access the private libtiff structures … which made the higher level
non-libtiff code be locked into a specific version of libtiff at compile time.
This caused no end of bug reports!</p>
<p>The new approach is for libtiff to read all tags from TIFF files. Those that
aren’t recognised as “core tags” (those having an associated <code class="docutils literal notranslate"><span class="pre">FIELD_</span></code> value,
and place for storage in the <code class="xref c c-struct docutils literal notranslate"><span class="pre">TIFFDirectory</span></code> structure) are now read into a
dynamic list of extra tags (<code class="xref c c-member docutils literal notranslate"><span class="pre">td_customValues</span></code> in <code class="xref c c-struct docutils literal notranslate"><span class="pre">TIFFDirectory</span></code>). When a new
tag code is encountered for the first time in a given TIFF file, a new
anonymous tag definition is created for the tag in the tag definition list.
The type, and some other metadata is worked out from the instance encountered.
These fields are known as “custom tags”.</p>
<p>Custom tags can be set and fetched normally using <a class="reference internal" href="../functions/TIFFSetField.html#c.TIFFSetField" title="TIFFSetField"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFSetField()</span></code></a> and
<a class="reference internal" href="../functions/TIFFGetField.html#c.TIFFGetField" title="TIFFGetField"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFGetField()</span></code></a>, and appear pretty much like normal tags to application code.
However, they have no impact on internal libtiff processing (such as
compression). Some utilities, such as <strong class="program">tiffcp</strong> will now copy these custom
tags to the new output files.</p>
<p>As well as the internal work with custom tags, new C API entry points
were added so that extension libraries, such as libgeotiff, could
define new tags more easily without accessing internal data structures.
Because tag handling of extension tags is done via the “custom fields”
mechanism as well, the definition provided externally mostly serves to provide
a meaningful name for the tag.</p>
<p>The addition of “custom tags” and the altered approach to extending libtiff
with externally defined tags is the primary reason for the shift to the
3.6.x version number from 3.5.x.</p>
</section>
</section>
<section id="software-configuration-changes">
<h2>Software configuration changes<a class="headerlink" href="#software-configuration-changes" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>, <code class="file docutils literal notranslate"><span class="pre">config.site</span></code>: Fix for large files (>2GiB) support. New
option in the config.site: <code class="docutils literal notranslate"><span class="pre">LARGEFILE="yes"</span></code>. Should be enough for the large
files I/O.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>: Set <code class="docutils literal notranslate"><span class="pre">-DPIXARLOG_SUPPORT</span></code> option along with <code class="docutils literal notranslate"><span class="pre">-DZIP_SUPPORT</span></code>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">html/Makefile.in</span></code>: Updated to use <strong class="program">groffhtml</strong> for generating html pages
from man pages.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/Makefile.in</span></code>: Added SCO OpenServer 5.0.6 support
from John H. DuBois III.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/Makefile.vc</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/libtiff.def</span></code>: Missed declarations added.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/Makefile.in</span></code>, <code class="file docutils literal notranslate"><span class="pre">tools/Makefile.in</span></code>: Shared library will not be
stripped when installing, utility binaries will do be stripped. As per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=93">Remote Sensing bugzilla #93 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">man/Makefile.in</span></code>: Patch <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> handling as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=95">Remote Sensing bugzilla #95 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>: OpenBSD changes for Sparc64 and DSO version as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=96">Remote Sensing bugzilla #96 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">config.site/configure</span></code>: added support for <code class="docutils literal notranslate"><span class="pre">OJPEG=yes</span></code> option to enable
OJPEG support from <code class="file docutils literal notranslate"><span class="pre">config.site</span></code>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">config.gues</span></code>, <code class="file docutils literal notranslate"><span class="pre">config.sub</span></code>: Updated from <a class="reference external" href="ftp.gnu.org/pub/config">ftp.gnu.org/pub/config</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>: Modify <code class="docutils literal notranslate"><span class="pre">CheckForBigEndian</span></code> so it can work in a cross
compiled situation.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">configure</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/Makefile.in</span></code>: Changes for building on MacOS 10.1
as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=94">Remote Sensing bugzilla #94 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">html/Makefile.in</span></code>: added missing images per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=92">Remote Sensing bugzilla #92 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">port/Makefile.in</span></code>: fixed clean target per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=92">Remote Sensing bugzilla #92 [no longer available]</a>.</p></li>
</ul>
</section>
<section id="library-changes">
<h2>Library changes<a class="headerlink" href="#library-changes" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_getimage.c</span></code>: New function <a class="reference internal" href="../functions/TIFFReadRGBAImage.html#c.TIFFReadRGBAImageOriented" title="TIFFReadRGBAImageOriented"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadRGBAImageOriented()</span></code></a>
implemented to retrieve raster array with user-specified origin position.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_fax3.c</span></code>: Fix wrong line numbering.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirread.c</span></code>: Check field counter against number of fields.</p></li>
<li><p>Store a list of opened IFD to prevent directory looping.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>: modified segment_height calculation to always
be a full height tile for tiled images. Also changed error to just
be a warning.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_lzw.c</span></code>: fixed so that decoder state isn’t allocated till
<code class="xref c c-func docutils literal notranslate"><span class="pre">LZWSetupDecode()</span></code>. Needed to read LZW files in “<code class="docutils literal notranslate"><span class="pre">r+</span></code>” mode.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dir.c</span></code>: fixed up the <code class="xref c c-member docutils literal notranslate"><span class="pre">tif_postdecode</span></code> settings responsible
for byte swapping complex image data.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_open.c</span></code>: Removed error if opening a compressed file
in update mode bug (<a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=198">Remote Sensing bugzilla #198 [no longer available]</a>).</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_write.c</span></code>: <a class="reference internal" href="../functions/TIFFWriteDirectory.html#c.TIFFWriteCheck" title="TIFFWriteCheck"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFWriteCheck()</span></code></a> now fails if the image is
a pre-existing compressed image. That is, image writing to pre-existing
compressed images is not allowed.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">html/man/*.html</span></code>: Web pages regenerated from man pages.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>: Hack to ensure that “boolean” is defined properly
on Windows so as to avoid the structure size mismatch error from libjpeg
(bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=188">Remote Sensing bugzilla #188 [no longer available]</a>).</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tiff.h</span></code>: <code class="docutils literal notranslate"><span class="pre">#ifdef</span> <span class="pre">USING_VISUALAGE</span></code> around previous Visual Age
AIX porting hack as it screwed up gcc. (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=39">Remote Sensing bugzilla #39 [no longer available]</a>)</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tiff.h</span></code>: added <code class="xref c c-macro docutils literal notranslate"><span class="pre">COMPRESSION_JP2000</span></code> (34712) for LEAD tools
custom compression.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirread.c</span></code>: Another fix for the fetching <code class="docutils literal notranslate"><span class="pre">SBYTE</span></code> arrays
by the <code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFFetchByteArray()</span></code> function. (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=52">Remote Sensing bugzilla #52 [no longer available]</a>)</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirread.c</span></code>: Expand <code class="docutils literal notranslate"><span class="pre">v[2]</span></code> to <code class="docutils literal notranslate"><span class="pre">v[4]</span></code> in <code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFFetchShortPair()</span></code>
as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=196">Remote Sensing bugzilla #196 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_lzw.c</span></code>: Additional consistency checking added in
<code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecode()</span></code> and <code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecodeCompat()</span></code> fixing bugs
<a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=190">Remote Sensing bugzilla #190 [no longer available]</a> and <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=100">Remote Sensing bugzilla #100 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_lzw.c</span></code>: Added check for valid code lengths in <code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecode()</span></code>
and <code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecodeCompat()</span></code>. Fixes bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=115">Remote Sensing bugzilla #115 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">tif_getimage.c</span></code>: Ensure that <a class="reference internal" href="../functions/TIFFRGBAImage.html#c.TIFFRGBAImageBegin" title="TIFFRGBAImageBegin"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFRGBAImageBegin()</span></code></a> returns the
return code from the underlying pick function as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=177">Remote Sensing bugzilla #177 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_strip.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_print.c</span></code>:
Hacked <code class="file docutils literal notranslate"><span class="pre">tif_jpeg.c</span></code> to fetch <code class="xref c c-macro docutils literal notranslate"><span class="pre">TIFFTAG_YCBCRSUBSAMPLING</span></code> from the jpeg
data stream if it isn’t present in the tiff tags as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=168">Remote Sensing bugzilla #168 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>: Fixed problem with setting of <code class="xref c c-var docutils literal notranslate"><span class="pre">nrows</span></code> in
<code class="xref c c-func docutils literal notranslate"><span class="pre">JPEGDecode()</span></code> as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=129">Remote Sensing bugzilla #129 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_read.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_write.c</span></code>: <a class="reference internal" href="../functions/TIFFReadScanline.html#c.TIFFReadScanline" title="TIFFReadScanline"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadScanline()</span></code></a> and
<a class="reference internal" href="../functions/TIFFWriteScanline.html#c.TIFFWriteScanline" title="TIFFWriteScanline"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFWriteScanline()</span></code></a> now set <code class="xref c c-member docutils literal notranslate"><span class="pre">tif_row</span></code> explicitly in case the codec has
fooled with the value as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=129">Remote Sensing bugzilla #129 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_ojpeg.c</span></code>: Major upgrade from Scott. Details in bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=156">Remote Sensing bugzilla #156 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_open.c</span></code>: Pointers to custom procedures
in <a class="reference internal" href="../functions/TIFFOpen.html#c.TIFFClientOpen" title="TIFFClientOpen"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFClientOpen()</span></code></a> are checked to be not <code class="xref c c-macro docutils literal notranslate"><span class="pre">NULL</span></code> pointers.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_lzw.c</span></code>: Assertions in <code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecode()</span></code> and <code class="xref c c-func docutils literal notranslate"><span class="pre">LZWDecodeCompat()</span></code>
replaced by warnings. Now libtiff should read corrupted LZW-compressed
files by skipping bad strips as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=100">Remote Sensing bugzilla #100 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirwrite.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_write.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tiffio.h</span></code>:
<a class="reference internal" href="../functions/TIFFWriteDirectory.html#c.TIFFCheckpointDirectory" title="TIFFCheckpointDirectory"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFCheckpointDirectory()</span></code></a> routine added as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=124">Remote Sensing bugzilla #124 [no longer available]</a>.
The <a class="reference internal" href="../functions/TIFFWriteDirectory.html"><span class="doc">TIFFWriteDirectory</span></a> man page discusses this new function as well as the related
<a class="reference internal" href="../functions/TIFFWriteDirectory.html#c.TIFFRewriteDirectory" title="TIFFRewriteDirectory"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFRewriteDirectory()</span></code></a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_codec.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_compress.c</span></code>,
<code class="file docutils literal notranslate"><span class="pre">libtiff/tiffiop.h</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_getimage.c</span></code>:
Introduced additional members <code class="docutils literal notranslate"><span class="pre">tif->tif_decodestatus</span></code> and <code class="docutils literal notranslate"><span class="pre">tif->tif_encodestatus</span></code>
for correct handling of unconfigured codecs (we should not try to read
data or to define data size without correct codecs). See bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=119">Remote Sensing bugzilla #119 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">tif_dirread.c</span></code>: avoid div-by-zero if <code class="xref c c-var docutils literal notranslate"><span class="pre">rowbytes</span></code> is zero in chop func as
per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=111">Remote Sensing bugzilla #111 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tiff.h</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dir.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dir.h</span></code>,
<code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirinfo.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirread.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirwrite.c</span></code>:
Dwight Kelly added get/put code for new tag <code class="docutils literal notranslate"><span class="pre">XMLPACKET</span></code> as
defined in Adobe XMP Technote. Added missing <code class="docutils literal notranslate"><span class="pre">INKSET</span></code> tag value from TIFF 6.0
spec <code class="docutils literal notranslate"><span class="pre">INKSET_MULTIINK</span></code> (=2). Added missing tags from Adobe TIFF technotes:
<code class="docutils literal notranslate"><span class="pre">CLIPPATH</span></code>, <code class="docutils literal notranslate"><span class="pre">XCLIPPATHUNITS</span></code>, <code class="docutils literal notranslate"><span class="pre">YCLIPPATHUNITS</span></code>, <code class="docutils literal notranslate"><span class="pre">OPIIMAGEID</span></code>, <code class="docutils literal notranslate"><span class="pre">OPIPROXY</span></code> and
<code class="docutils literal notranslate"><span class="pre">INDEXED</span></code>. Added <code class="docutils literal notranslate"><span class="pre">PHOTOMETRIC</span></code> tag value from TIFF technote 4 <code class="docutils literal notranslate"><span class="pre">ICCLAB</span></code> (=9).</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_getimage.c</span></code>: Additional check for supported codecs added in
<a class="reference internal" href="../functions/TIFFRGBAImage.html#c.TIFFRGBAImageOK" title="TIFFRGBAImageOK"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFRGBAImageOK()</span></code></a>, <a class="reference internal" href="../functions/TIFFReadRGBAImage.html#c.TIFFReadRGBAImage" title="TIFFReadRGBAImage"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadRGBAImage()</span></code></a>, <a class="reference internal" href="../functions/TIFFReadRGBAStrip.html#c.TIFFReadRGBAStrip" title="TIFFReadRGBAStrip"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadRGBAStrip()</span></code></a> and
<a class="reference internal" href="../functions/TIFFReadRGBATile.html#c.TIFFReadRGBATile" title="TIFFReadRGBATile"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadRGBATile()</span></code></a> now use <a class="reference internal" href="../functions/TIFFRGBAImage.html#c.TIFFRGBAImageOK" title="TIFFRGBAImageOK"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFRGBAImageOK()</span></code></a> before reading a per bug
<a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=110">Remote Sensing bugzilla #110 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dir.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dir.h</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirinfo.c</span></code>,
<code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirread.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirwrite.c</span></code>:
Added routine <a class="reference internal" href="../functions/TIFFDataWidth.html#c.TIFFDataWidth" title="TIFFDataWidth"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFDataWidth()</span></code></a> for determining
<code class="xref c c-enum docutils literal notranslate"><span class="pre">TIFFDataType</span></code> sizes instead of working with <code class="xref c c-var docutils literal notranslate"><span class="pre">tiffDataWidth</span></code> array
directly as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=109">Remote Sensing bugzilla #109 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirinfo.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_dirwrite.c</span></code>: Added possibility to
read broken TIFFs with <code class="docutils literal notranslate"><span class="pre">LONG</span></code> type used for <code class="xref c c-macro docutils literal notranslate"><span class="pre">TIFFTAG_COMPRESSION</span></code>,
<code class="xref c c-macro docutils literal notranslate"><span class="pre">TIFFTAG_BITSPERSAMPLE</span></code>, <code class="xref c c-macro docutils literal notranslate"><span class="pre">TIFFTAG_PHOTOMETRIC</span></code> as per bug
<a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=99">Remote Sensing bugzilla #99 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tiff.h</span></code>, <code class="file docutils literal notranslate"><span class="pre">libtiff/tif_fax3.c</span></code>: Add support for
:c:macro:<code class="docutils literal notranslate"><span class="pre">__arch64__</span></code> as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=94">Remote Sensing bugzilla #94 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_read.c</span></code>: Fixed <a class="reference internal" href="../functions/TIFFReadEncodedStrip.html#c.TIFFReadEncodedStrip" title="TIFFReadEncodedStrip"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadEncodedStrip()</span></code></a> to fail if the
decodestrip function returns anything not greater than zero as per bug
<a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=97">Remote Sensing bugzilla #97 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>: fixed computation of <code class="xref c c-var docutils literal notranslate"><span class="pre">segment_width</span></code> for
tiled files to avoid error about it not matching the
<code class="docutils literal notranslate"><span class="pre">cinfo.d.image_width</span></code> values (“JPEGPreDecode: Improper JPEG strip/tile
size.”) for ITIFF files. Apparently the problem was incorporated since
3.5.5, presumably during the OJPEG/JPEG work recently.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_getimage.c</span></code>: If <code class="xref c c-macro docutils literal notranslate"><span class="pre">DEFAULT_EXTRASAMPLE_AS_ALPHA</span></code> is 1
(defined in <code class="file docutils literal notranslate"><span class="pre">tiffconf.h</span></code> - 1 by default) then the RGBA interface
will assume that a fourth extra sample is <code class="docutils literal notranslate"><span class="pre">ASSOCALPHA</span></code> if the
<code class="docutils literal notranslate"><span class="pre">EXTRASAMPLE</span></code> value isn’t set for it. This changes the behaviour of
the library, but makes it work better with RGBA files produced by
lots of applications that don’t mark the alpha values properly.
As per bugs <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=93">Remote Sensing bugzilla #93 [no longer available]</a> and <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=65">Remote Sensing bugzilla #65 [no longer available]</a>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/tif_jpeg.c</span></code>: allow jpeg data stream sampling values to
override those from tiff directory. This makes this work with
ImageGear generated files.</p></li>
</ul>
</section>
<section id="tools-changes">
<h2>Tools changes<a class="headerlink" href="#tools-changes" title="Permalink to this heading">¶</a></h2>
<ul>
<li><p><strong class="program">tiff2ps</strong>:</p>
<ul class="simple">
<li><p>Added page size setting when creating PS Level 2.</p></li>
<li><p>Fixed PS comment emitted when FlateDecode is being used.</p></li>
</ul>
</li>
<li><p><strong class="program">tiffsplit</strong>: increased the maximum number of pages that can be split.</p></li>
<li><p><strong class="program">raw2tiff</strong>:</p>
<ul class="simple">
<li><p>New utility for turning raw raster images into TIFF files
written by Andrey Kiselev.</p></li>
<li><p>Added option “<code class="docutils literal notranslate"><span class="pre">-p</span></code>” to explicitly select color space of input image data.</p></li>
</ul>
</li>
<li><p><strong class="program">tiffmedian</strong>: Support for large (> 2GB) images.</p></li>
<li><p><strong class="program">ppm2tiff</strong>: Fixed possible endless loop.</p></li>
<li><p><strong class="program">tiff2rgba</strong>: Switched to use :c:func:TIFFReadRGBAImageOriented
instead of <a class="reference internal" href="../functions/TIFFReadRGBAImage.html#c.TIFFReadRGBAImage" title="TIFFReadRGBAImage"><code class="xref c c-func docutils literal notranslate"><span class="pre">TIFFReadRGBAImage()</span></code></a>.</p></li>
<li><p><strong class="program">tiffcmp</strong>: Fixed problem with unused data comparing (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=349">Remote Sensing bugzilla #349 [no longer available]</a>).
“<code class="docutils literal notranslate"><span class="pre">-z</span></code>” option now can be used to set the number of reported different bytes.</p></li>
<li><p><strong class="program">tiffcp</strong>:</p>
<ul class="simple">
<li><p>Added possibility to specify value -1 to “<code class="docutils literal notranslate"><span class="pre">-r</span></code>” option to get the entire image as one strip
(bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=343">Remote Sensing bugzilla #343 [no longer available]</a>).</p></li>
<li><p>Set the correct <code class="docutils literal notranslate"><span class="pre">RowsPerStrip</span></code> and <code class="docutils literal notranslate"><span class="pre">PageNumber</span></code> values (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=343">Remote Sensing bugzilla #343 [no longer available]</a>).</p></li>
<li><p>Fixed problem with colorspace conversion for JPEG encoded images (bugs <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=23">Remote Sensing bugzilla #23 [no longer available]</a>
and <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=275">Remote Sensing bugzilla #275 [no longer available]</a>)</p></li>
<li><p>Added support for <code class="docutils literal notranslate"><span class="pre">Orientation</span></code> tag.</p></li>
</ul>
</li>
<li><p><strong class="program">fax2tiff</strong>:</p>
<ul class="simple">
<li><p>Page numbering fixed (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=341">Remote Sensing bugzilla #341 [no longer available]</a>).</p></li>
<li><p>Applied patch from Julien Gaulmin. More switches for <strong class="program">fax2tiff</strong> tool for better control
of input and output (bugs <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=272">Remote Sensing bugzilla #272 [no longer available]</a> and <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=293">Remote Sensing bugzilla #293 [no longer available]</a>).</p></li>
<li><p>Updated to reflect latest changes in libtiff per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=125">Remote Sensing bugzilla #125 [no longer available]</a>.</p></li>
</ul>
</li>
<li><p><strong class="program">ppm2tiff</strong>: PPM header parser improved: now able to skip comments.</p></li>
<li><p><strong class="program">tiff2ps</strong>:</p>
<ul>
<li><p>Sebastian Eken provided patches (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=200">Remote Sensing bugzilla #200 [no longer available]</a>) to add new these new switches:</p>
<dl class="simple">
<dt>“<code class="docutils literal notranslate"><span class="pre">-b</span> <span class="pre">#</span></code>”:</dt><dd><p>for a bottom margin of # inches</p>
</dd>
<dt>“<code class="docutils literal notranslate"><span class="pre">-c</span></code>”:</dt><dd><p>center image</p>
</dd>
<dt>“<code class="docutils literal notranslate"><span class="pre">-l</span> <span class="pre">#</span></code>”:</dt><dd><p>for a left margin of # inches</p>
</dd>
<dt>“<code class="docutils literal notranslate"><span class="pre">-r</span></code>”:</dt><dd><p>rotate the image by 180 degrees</p>
</dd>
</dl>
<p>Also, new features merged with code for shrinking/overlapping.</p>
</li>
<li><p>Force deadzone printing when EPS output specified (bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=325">Remote Sensing bugzilla #325 [no longer available]</a>).</p></li>
<li><p>Add ability to generate PS Level 3. It basically allows one to use the <code class="docutils literal notranslate"><span class="pre">/flateDecode</span></code>
filter for ZIP compressed TIFF images. Patch supplied by Tom Kacvinsky
(bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=328">Remote Sensing bugzilla #328 [no longer available]</a>).</p></li>
<li><p>Don’t emit <code class="docutils literal notranslate"><span class="pre">BeginData</span></code>/<code class="docutils literal notranslate"><span class="pre">EndData</span></code> DSC comments since we are unable to properly
include the amount to skip as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=80">Remote Sensing bugzilla #80 [no longer available]</a>.</p></li>
<li><p>Added workaround for some software that may crash when last strip of image contains fewer
number of scanlines than specified by the <code class="docutils literal notranslate"><span class="pre">/Height</span></code> variable as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=164">Remote Sensing bugzilla #164 [no longer available]</a>.</p></li>
<li><p>Patch from John Williams to add new functionality for splitting long images in several pages as
per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=142">Remote Sensing bugzilla #142 [no longer available]</a>. New switches:</p>
<dl class="simple">
<dt>“<code class="docutils literal notranslate"><span class="pre">-H</span> <span class="pre">#</span></code>”:</dt><dd><p>split image if height is more than # inches</p>
</dd>
<dt>“<code class="docutils literal notranslate"><span class="pre">-L</span> <span class="pre">#</span></code>”:</dt><dd><p>overLap split images by # inches</p>
</dd>
</dl>
</li>
<li><p>New commandline switches to override resolution units obtained from the input file per
bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=131">Remote Sensing bugzilla #131 [no longer available]</a>:</p>
<dl class="simple">
<dt>“<code class="docutils literal notranslate"><span class="pre">-x</span></code>”:</dt><dd><p>override resolution units as centimeters</p>
</dd>
<dt>“<code class="docutils literal notranslate"><span class="pre">-y</span></code>”:</dt><dd><p>override resolution units as inches</p>
</dd>
</dl>
</li>
<li><p>tiff2ps: Division by zero fixed as per bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=88">Remote Sensing bugzilla #88 [no longer available]</a>.</p></li>
</ul>
</li>
<li><p><strong class="program">tiffdump</strong>: include <code class="xref c c-macro docutils literal notranslate"><span class="pre">TIFFTAG_JPEGTABLES</span></code> in tag list.</p></li>
<li><p><strong class="program">tiffset</strong>: fix bug in error reporting.</p></li>
</ul>
</section>
<section id="contributed-software-changes">
<h2>Contributed software changes<a class="headerlink" href="#contributed-software-changes" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p>Fixed distribution to include <code class="file docutils literal notranslate"><span class="pre">contrib/addtiffo/tif_ovrcache.c</span></code>, <code class="file docutils literal notranslate"><span class="pre">contrib/addtiffo/tif_ovrcache.h</span></code>.</p></li>
<li><p><code class="file docutils literal notranslate"><span class="pre">libtiff/contrib/win95</span></code>: renamed to <code class="file docutils literal notranslate"><span class="pre">contrib/win_dib</span></code>. Added new
<code class="file docutils literal notranslate"><span class="pre">Tiffile.cpp</span></code> example of converting TIFF files into a DIB on Win32 as per
bug <a class="reference external" href="http://bugzilla.remotesensing.org/show_bug.cgi?id=143">Remote Sensing bugzilla #143 [no longer available]</a>.</p></li>
</ul>
</section>
<section id="lzw-compression-kit-changes">
<h2>LZW compression kit changes<a class="headerlink" href="#lzw-compression-kit-changes" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p>LZW compression kit synchronized with actual libtiff version.</p></li>
</ul>
</section>
</section>
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<h3><a href="../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Changes in TIFF v3.6.0</a><ul>
<li><a class="reference internal" href="#major-changes">Major changes</a><ul>
<li><a class="reference internal" href="#custom-tag-support">Custom Tag Support</a></li>
</ul>
</li>
<li><a class="reference internal" href="#software-configuration-changes">Software configuration changes</a></li>
<li><a class="reference internal" href="#library-changes">Library changes</a></li>
<li><a class="reference internal" href="#tools-changes">Tools changes</a></li>
<li><a class="reference internal" href="#contributed-software-changes">Contributed software changes</a></li>
<li><a class="reference internal" href="#lzw-compression-kit-changes">LZW compression kit changes</a></li>
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