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Edit: /usr/share/doc/libtiff-devel/html/v4.2.0.html (6198B)

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>
 Changes in TIFF v4.2.0
</TITLE>
<STYLE TYPE="text/css">
body {
 font-family: Helvetica, Arial, Sans;
}
table, th, td {
 border: 1px solid black;
 border-collapse: collapse;
}
th, td {
 padding: 8pt;
 text-align: center;
}
th {
 text-align: center;
}
td {
 text-align: center;
}

ul li {
    padding: 3pt;
}

ul.a {
    list-style-type: circle;
}

ul.b {
    list-style-type: square;
}

ol.c {
    list-style-type: upper-roman;
}

ol.d {
    list-style-type: lower-alpha;
}

hr {
    width: 65%;
}

</STYLE>
</HEAD>

<BASEFONT SIZE=4>
TIFF CHANGE INFORMATION
<BASEFONT SIZE=3>

<div style="margin-left: 3em">
<HR SIZE=4 ALIGN=left>
Current Version: v4.2.0 
Previous Version: <A HREF="v4.1.0.html">v4.1.0</A> 
Master Download Site: <A HREF="https://download.osgeo.org/libtiff">
download.osgeo.org</a>, directory pub/libtiff 
Master HTTP Site #1: <A HREF="http://www.simplesystems.org/libtiff/">
 http://www.simplesystems.org/libtiff/</A> 
Master HTTP Site #2: <A HREF="https://libtiff.gitlab.io/libtiff/">
 https://libtiff.gitlab.io/libtiff/</A> 
Master HTTP Site #3: <A HREF="http://libtiff.maptools.org/">
http://libtiff.maptools.org/</a>
<HR SIZE=4 ALIGN=left>
</div>

This document provides a summary of significant changes made to the
software between the previous and current versions (see
above). A fully-detailed change summary is provided by the ChangeLog file
included in the release package and by the Git commit history:
<UL>
<LI><A HREF="#highlights">Major Changes</A>
<LI><A HREF="#configure">Changes in the software configuration</A>
<LI><A HREF="#libtiff">Changes in libtiff</A>
<LI><A HREF="#tools">Changes in the tools</A>
<LI><A HREF="#contrib">Changes in the contrib area</A>
</UL>

<HR ALIGN=left>

<A NAME="highlights">MAJOR CHANGES:</A>

<UL>

<LI>Optional support for using libdeflate is added.</LI>

<LI>Many of the tools now support a memory usage limit.</LI>

</UL>

<A NAME="configure">CHANGES IN THE SOFTWARE CONFIGURATION:</A>

<UL>

<LI>The Microsoft Windows 'nmake' build is resuscitated and provides
 a default HAVE_STRTOLL setting in 'nmake.opt' which is suitable for
 MSVC++ 14.0 ("Visual Studio 2015") and later but may be disabled in
 order to compile with earlier compiler versions.</LI>

<LI>mingw-w64 cmake build fixes to not add libm</LI>

</UL>

<A NAME="libtiff">CHANGES IN LIBTIFF:</A>

<UL>

<LI>A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.</LI>

<LI>EXIF 2.32 and GPS tags and functionality have been upgraded:
 <UL>
 <LI>Existing EXIF field definition of tags are upgraded to EXIF version 2.3.2</LI>
 <LI>EXIF-GPS structure, tags and access functions are added as special CustomDirectory (like it was done for EXIF).</LI>
 <LI>Reading error for FileSource and SceneType tags corrected.</LI>
 </UL>

<LI>Make TIFFTAG_CFAPATTERN variable count.</LI>

<LI>Cmake configuration fixes for big-endian targets.</LI>

<LI>Added support for optional building against libdeflate for
 faster Zip/Deflate compression/decompression.

We now have 2 kinds of builds with the Zip/Deflate codec:
 <UL>
 <LI>zlib only</LI>
 <LI>zlib + libdeflate</LI>
 </UL>

Speed improvements in the 35%-50% range can be expected when libdeflate is used.
 Compression level up to 12 is now supported (capped to 9 when zlib is used).
 Still requires zlib for situations where libdeflate cannot be used (that
 is for scanline access, since libdeflate has no streaming mode)

Pseudo-tag TIFFTAG_DEFLATE_SUBCODEC=DEFLATE_SUBCODEC_ZLIB/DEFLATE_SUBCODEC_LIBDEFLATE
 is added to control which subcodec (zlib or libdeflate) should be used (it defaults
 of course to libdeflate, when it is available).
 This is mostly aimed at being used on the writing side, to be able to reproduce
 output of previous libtiff versions at a binary level, in situations where this would
 be really needed. Or as a safety belt in case there would be unforeseen issues
 with using libdeflate.
 It can be used to know when libdeflate is available at runtime (DEFLATE_SUBCODEC_LIBDEFLATE
 will be the default value in that situation).
 Of course, deflate codestreams produced by libdeflate can be read by zlib, and vice-versa.

</LI>

</UL>

<A NAME="tools">CHANGES IN THE TOOLS:</A>

<UL>

<LI>A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.</LI>

<LI>ppm2tiff: support any bps value from 1 to 16.</LI>

<LI>tiff2ps, tiff2rgba: A default memory limit is now enforced (256MiB) and a '-M' option is added to allow the user to adjust the limit.</LI>

<LI>tiff2pdf, tiffcp: A default memory limit is now enforced (256MiB) and a '-m' option is added to allow the user to adjust the limit.</LI>

<LI>tiffcrop: A default memory limit is now enforced (256MiB) and a '-k' option is added to allow the user to adjust the limit.</LI>

<LI>tiff2pdf: fix "raw" copy of Deflate streams.</LI>

<LI>tiff2pdf.c: properly calculate datasize when saving to JPEG YCbCr</LI>

<LI>tiffcp: disable strip chopping when trying to convert to JBIG compression</LI>

</UL>

<A NAME="contrib">CHANGES IN THE CONTRIB AREA:</A>

<UL>

</UL>

</BODY>
</HTML>

Changes in TIFF v4.2.0 TIFF CHANGE INFORMATION

Current Version: v4.2.0
Previous Version: v4.1.0
Master Download Site: download.osgeo.org, directory pub/libtiff
Master HTTP Site #1: http://www.simplesystems.org/libtiff/
Master HTTP Site #2: https://libtiff.gitlab.io/libtiff/
Master HTTP Site #3: http://libtiff.maptools.org/

This document provides a summary of significant changes made to the software between the previous and current versions (see above). A fully-detailed change summary is provided by the ChangeLog file included in the release package and by the Git commit history:

Major Changes
Changes in the software configuration
Changes in libtiff
Changes in the tools
Changes in the contrib area

MAJOR CHANGES:

Optional support for using libdeflate is added.
Many of the tools now support a memory usage limit.

CHANGES IN THE SOFTWARE CONFIGURATION:

The Microsoft Windows 'nmake' build is resuscitated and provides a default HAVE_STRTOLL setting in 'nmake.opt' which is suitable for MSVC++ 14.0 ("Visual Studio 2015") and later but may be disabled in order to compile with earlier compiler versions.
mingw-w64 cmake build fixes to not add libm

CHANGES IN LIBTIFF:

A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.
EXIF 2.32 and GPS tags and functionality have been upgraded:
- Existing EXIF field definition of tags are upgraded to EXIF version 2.3.2
- EXIF-GPS structure, tags and access functions are added as special CustomDirectory (like it was done for EXIF).
- Reading error for FileSource and SceneType tags corrected.
Make TIFFTAG_CFAPATTERN variable count.
Cmake configuration fixes for big-endian targets.
Added support for optional building against libdeflate for faster Zip/Deflate compression/decompression.

We now have 2 kinds of builds with the Zip/Deflate codec:
- zlib only
- zlib + libdeflate
Speed improvements in the 35%-50% range can be expected when libdeflate is used. Compression level up to 12 is now supported (capped to 9 when zlib is used). Still requires zlib for situations where libdeflate cannot be used (that is for scanline access, since libdeflate has no streaming mode)

Pseudo-tag TIFFTAG_DEFLATE_SUBCODEC=DEFLATE_SUBCODEC_ZLIB/DEFLATE_SUBCODEC_LIBDEFLATE is added to control which subcodec (zlib or libdeflate) should be used (it defaults of course to libdeflate, when it is available). This is mostly aimed at being used on the writing side, to be able to reproduce output of previous libtiff versions at a binary level, in situations where this would be really needed. Or as a safety belt in case there would be unforeseen issues with using libdeflate. It can be used to know when libdeflate is available at runtime (DEFLATE_SUBCODEC_LIBDEFLATE will be the default value in that situation).

Of course, deflate codestreams produced by libdeflate can be read by zlib, and vice-versa.

CHANGES IN THE TOOLS:

A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.
ppm2tiff: support any bps value from 1 to 16.
tiff2ps, tiff2rgba: A default memory limit is now enforced (256MiB) and a '-M' option is added to allow the user to adjust the limit.
tiff2pdf, tiffcp: A default memory limit is now enforced (256MiB) and a '-m' option is added to allow the user to adjust the limit.
tiffcrop: A default memory limit is now enforced (256MiB) and a '-k' option is added to allow the user to adjust the limit.
tiff2pdf: fix "raw" copy of Deflate streams.
tiff2pdf.c: properly calculate datasize when saving to JPEG YCbCr
tiffcp: disable strip chopping when trying to convert to JBIG compression

CHANGES IN THE CONTRIB AREA:

None