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<HTML>
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<HEAD>
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<TITLE>
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Changes in TIFF v3.6.0
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</TITLE>
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</HEAD>
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<BODY BGCOLOR=white>
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<FONT FACE="Helvetica, Arial, Sans">
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<FONT FACE="Helvetica, Arial, Sans">
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<BASEFONT SIZE=4>
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<FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION
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<BASEFONT SIZE=3>
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Current Version: v3.6.0
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Previous Version: v3.5.7
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Master FTP Site:
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ftp.remotesensing.org, directory pub/libtiff
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Master HTTP Site:
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http://www.remotesensing.org/libtiff
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This document describes the changes made to the software between the
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previous and current versions (see above).
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If you don't find something listed here, then it was not done in this
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timeframe, or it was not considered important enough to be mentioned.
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The following information is located here:
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Major Changes
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Changes in the software configuration
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Changes in libtiff
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Changes in the tools
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Changes in the contrib area
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Changes in the LZW compression kit
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<FONT SIZE=+3>M</FONT>AJOR CHANGES:
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New utility raw2tiff
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for converting raw rasters into TIFF files.
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Lots of new tiff2ps options.
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Lots of new fax2tiff options.
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Lots of bug fixes for LZW, JPEG and OJPEG compression.
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Custom Tag Support
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The approach to extending libtiff with custom tags has changed radically.
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Previously, all internally supported TIFF tags had a place in the
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private TIFFDirectory structure within libtiff to hold the values (if read),
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and a "field number" (ie. FIELD_SUBFILETYPE) used to identify that tag.
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However, every time a new tag was added to the core, the size of the
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TIFFDirectory structure would changing, breaking any dynamically linked
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software that used the private data structures.
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Also, any tag not recognised
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by libtiff would not be read and accessable to applications without some
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fairly complicated work on the applications part to pre-register the tags
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as exemplified by the support for "Geo"TIFF tags by libgeotiff layered on
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libtiff.
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Amoung other things this approach required the extension code
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to access the private libtiff structures ... which made the higher level
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non-libtiff code be locked into a specific version of libtiff at compile time.
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This caused no end of bug reports!
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The new approach is for libtiff to read all tags from TIFF files. Those that
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aren't recognised as "core tags" (those having an associated FIELD_ value,
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and place for storage in the TIFFDirectory structure) are now read into a
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dynamic list of extra tags (td_customValues in TIFFDirectory). When a new
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tag code is encountered for the first time in a given TIFF file, a new
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anonymous tag definition is created for the tag in the tag definition list.
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The type, and some other metadata is worked out from the instance encountered.
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These fields are known as "custom tags".
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Custom tags can be set and fetched normally using TIFFSetField() and
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TIFFGetField(), and appear pretty much like normal tags to application code.
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However, they have no impact on internal libtiff processing (such as
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compression). Some utilities, such as tiffcp will now copy these custom
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tags to the new output files.
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As well as the internal work with custom tags, new C API entry points
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were added so that extension libraries, such as libgeotiff, could
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define new tags more easily without accessing internal data structures.
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Because tag handling of extension tags is done via the "custom fields"
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mechanism as well, the definition provided externally mostly serves to provide
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a meaningful name for the tag.
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The addition of "custom tags" and the altered approach to extending libtiff
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with externally defined tags is the primary reason for the shift to the
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3.6.x version number from 3.5.x.
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<FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:
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configure, config.site: Fix for large files (>2GiB) support. New
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option in the config.site: LARGEFILE="yes". Should be enougth for the large
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files I/O.
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configure: Set -DPIXARLOG_SUPPORT option along with -DZIP_SUPPORT.
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html/Makefile.in: Updated to use groffhtml for generating html pages
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from man pages.
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configure, libtiff/Makefile.in: Added SCO OpenServer 5.0.6 support
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from John H. DuBois III.
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libtiff/{Makefile.vc, libtiff.def}: Missed declarations added.
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libtiff/Makefile.in, tools/Makefile.in: Shared library will not be
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stripped when installing, utility binaries will do be stripped. As per bug 93.
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man/Makefile.in: Patch DESTDIR handling as per bug 95.
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configure: OpenBSD changes for Sparc64 and DSO version as per bug 96.
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config.site/configure: added support for OJPEG=yes option to enable
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OJPEG support from config.site.
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config.guess, config.sub: Updated from ftp.gnu.org/pub/config.
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configure: Modify CheckForBigEndian so it can work in a cross
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compiled situation.
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configure, libtiff/Makefile.in: Changes for building on MacOS 10.1
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as per bug 94.
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html/Makefile.in: added missing images per bug 92.
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port/Makefile.in: fixed clean target per bug 92.
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<FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:
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libtiff/tif_getimage.c: New function
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HREF="./man/TIFFReadRGBAImage.3t.html">TIFFReadRGBAImageOriented()
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implemented to retrieve raster array with user-specified origin position.
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libtiff/tif_fax3.c: Fix wrong line numbering.
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libtiff/tif_dirread.c: Check field counter against number of fields.
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Store a list of opened IFD to prevent directory looping.
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libtiff/tif_jpeg.c: modified segment_height calculation to always
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be a full height tile for tiled images. Also changed error to just
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be a warning.
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libtiff/tif_lzw.c: fixed so that decoder state isn't allocated till
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LZWSetupDecode(). Needed to read LZW files in "r+" mode.
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libtiff/tif_dir.c: fixed up the tif_postdecode settings responsible
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for byte swapping complex image data.
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libtiff/tif_open.c: Removed error if opening a compressed file
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in update mode bug (198).
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libtiff/tif_write.c: TIFFWriteCheck() now fails if the image is
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a pre-existing compressed image. That is, image writing to pre-existing
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compressed images is not allowed.
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html/man/*.html: Web pages regenerated from man pages.
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libtiff/tif_jpeg.c: Hack to ensure that "boolean" is defined properly
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on Windows so as to avoid the structure size mismatch error from libjpeg
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(bug 188).
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libtiff/tiff.h: #ifdef USING_VISUALAGE around previous Visual Age
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AIX porting hack as it screwed up gcc. (bug 39)
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libtiff/tiff.h: added COMPRESSION_JP2000 (34712) for LEAD tools
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custom compression.
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libtiff/tif_dirread.c: Another fix for the fetching SBYTE arrays
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by the TIFFFetchByteArray() function. (bug 52)
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libtiff/tif_dirread.c: Expand v[2] to v[4] in TIFFFetchShortPair()
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as per bug 196.
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libtiff/tif_lzw.c: Additional consistency checking added in
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LZWDecode() and LZWDecodeCompat() fixing bugs 190 and 100.
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libtiff/tif_lzw.c: Added check for valid code lengths in LZWDecode()
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and LZWDecodeCompat(). Fixes bug 115.
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tif_getimage.c: Ensure that TIFFRGBAImageBegin() returns the
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return code from the underlying pick function as per bug 177.
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libtiff/{tif_jpeg.c,tif_strip.c,tif_print.c}: Hacked tif_jpeg.c to
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fetch TIFFTAG_YCBCRSUBSAMPLING from the jpeg data stream if it isn't
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present in the tiff tags as per bug 168.
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libtiff/tif_jpeg.c: Fixed problem with setting of nrows in
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JPEGDecode() as per bug 129.
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libtiff/tif_read.c, libtiff/tif_write.c: TIFFReadScanline() and
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TIFFWriteScanline() now set tif_row explicitly in case the codec has
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fooled with the value as per bug 129.
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libtiff/tif_ojpeg.c: Major upgrade from Scott. Details in bug 156.
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libtiff/tif_open.c: Pointers to custom procedures
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in TIFFClientOpen() are checked to be not NULL-pointers.
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libtiff/tif_lzw.c: Assertions in LZWDecode and LZWDecodeCompat
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replaced by warnings. Now libtiff should read corrupted LZW-compressed
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files by skipping bad strips as per bug 100.
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libtiff/: tif_dirwrite.c, tif_write.c, tiffio.h:
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TIFFCheckpointDirectory()
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routine added as per bug 124. The
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TIFFWriteDirectory
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man page discusses this new function as well as the related
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TIFFRewriteDirectory().
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libtiff/: tif_codec.c, tif_compress.c, tiffiop.h, tif_getimage.c:
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Introduced
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additional members tif->tif_decodestatus and tif->tif_encodestatus
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for correct handling of unconfigured codecs (we should not try to read
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data or to define data size without correct codecs). See bug 119.
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tif_dirread.c: avoid div-by-zero if rowbytes is zero in chop func as
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per bug 111.
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libtiff/: tiff.h, tif_dir.c, tif_dir.h, tif_dirinfo.c, tif_dirread.c,
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tif_dirwrite.c: Dwight Kelly added get/put code for new tag XMLPACKET as
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defined in Adobe XMP Technote. Added missing INKSET tag value from TIFF 6.0
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spec INKSET_MULTIINK (=2). Added missing tags from Adobe TIFF technotes:
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CLIPPATH, XCLIPPATHUNITS, YCLIPPATHUNITS, OPIIMAGEID, OPIPROXY and
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INDEXED. Added PHOTOMETRIC tag value from TIFF technote 4 ICCLAB (=9).
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libtiff/tif_getimage.c: Additional check for supported codecs added in
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TIFFRGBAImageOK, TIFFReadRGBAImage, TIFFReadRGBAStrip and TIFFReadRGBATile now
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use TIFFRGBAImageOK before reading a per bug 110.
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libtiff/: tif_dir.c, tif_dir.h, tif_dirinfo.c, tif_dirread.c,
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tif_dirwrite.c: Added routine
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TIFFDataWidth for determining
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TIFFDataType sizes instead of working with tiffDataWidth array
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directly as per bug 109.
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libtiff/: tif_dirinfo.c, tif_dirwrite.c: Added possibility to
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read broken TIFFs with LONG type used for TIFFTAG_COMPRESSION,
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TIFFTAG_BITSPERSAMPLE, TIFFTAG_PHOTOMETRIC as per bug 99.
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libtiff/{tiff.h,tif_fax3.c}: Add support for __arch64__ as per bug 94.
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libtiff/tif_read.c: Fixed TIFFReadEncodedStrip() to fail if the
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decodestrip function returns anything not greater than zero as per bug 97.
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libtiff/tif_jpeg.c: fixed computation of segment_width for
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tiles files to avoid error about it not matching the
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cinfo.d.image_width values ("JPEGPreDecode: Improper JPEG strip/tile
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size.") for ITIFF files. Apparently the problem was incorporated since
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3.5.5, presumably during the OJPEG/JPEG work recently.
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libtiff/tif_getimage.c: If DEFAULT_EXTRASAMPLE_AS_ALPHA is 1
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(defined in tiffconf.h - 1 by default) then the RGBA interface
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will assume that a fourth extra sample is ASSOCALPHA if the
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EXTRASAMPLE value isn't set for it. This changes the behaviour of
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the library, but makes it work better with RGBA files produced by
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lots of applications that don't mark the alpha values properly.
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As per bugs 93 and 65.
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libtiff/tif_jpeg.c: allow jpeg data stream sampling values to
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override those from tiff directory. This makes this work with
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ImageGear generated files.
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<FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:
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tiff2ps: Added page size setting
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when creating PS Level 2.
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tiff2ps: Fixed PS comment emitted when
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FlateDecode is being used.
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tiffsplit: increased the maximum
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number of pages that can be split.
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raw2tiff: Added option `-p' to
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explicitly select color space of input image data.
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tiffmedian: Suppiort for large
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(> 2GB) images.
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ppm2tiff: Fixed possible endless loop.
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tiff2rgba: Switched to use
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TIFFReadRGBAImageOriented()
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instead of TIFFReadRGBAImage().
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tiffcmp: Fixed problem with unused data
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comparing (bug 349). `-z' option now can be used to set the number of reported
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different bytes.
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tiffcp: Added possibility to specify
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value -1 to -r option to get the entire image as one strip (bug 343).
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tiffcp: Set the correct RowsPerStrip
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and PageNumber values (bug 343).
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fax2tiff: Page numbering fixed (bug
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341).
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ppm2tiff: PPM header parser improved:
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now able to skip comments.
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tiff2ps: Force deadzone printing when
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EPS output specified (bug 325).
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tiff2ps: Add ability to generate
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PS Level 3. It basically allows one to use the /flateDecode filter for ZIP
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compressed TIFF images. Patch supplied by Tom Kacvinsky (bug 328).
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tiffcp: Fixed problem with colorspace
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conversion for JPEG encoded images (bugs 23 and 275)
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fax2tiff: Applied patch from
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Julien Gaulmin. More switches for fax2tiff tool for better control
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of input and output (bugs 272 and 293).
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raw2tiff:
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New utility for turning raw raster images into TIFF files
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written by Andrey Kiselev.
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tiff2ps:
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Sebastian Eken provided patches (bug 200) to add new these new
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switches:
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-b #: for a bottom margin of # inches
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-c: center image
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-l #: for a left margin of # inches
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-r: rotate the image by 180 degrees
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Also, new features merged with code for shrinking/overlapping.
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tiff2ps: Don't emit BeginData/EndData
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DSC comments since we are unable to properly include the amount to skip
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as per bug 80.
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tiff2ps: Added workaround for some
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software that may crash when last strip of image contains fewer number
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of scanlines than specified by the `/Height' variable as per bug 164.
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tiff2ps: Patch from John Williams to add new
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functionality for tiff2ps utility splitting long images in several pages as
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per bug 142. New switches:
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-H #: split image if height is more than # inches
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-L #: overLap split images by # inches
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tiff2ps: New commandline
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switches to override resolution units obtained from the input file per bug 131:
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-x: override resolution units as centimeters
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-y: override resolution units as inches
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fax2tiff: Updated to reflect
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latest changes in libtiff per bug 125.
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tiff2ps: Division by zero fixed as per bug 88.
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tiffcp:
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Added support for 'Orientation' tag.
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tiffdump:
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include TIFFTAG_JPEGTABLES in tag list.
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tiffset: fix bug in error reporting.
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<FONT SIZE=+3>C</FONT>HANGES IN THE CONTRIB AREA:
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Fixed distribution to include contrib/addtiffo/tif_ovrcache.{c,h}.
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libtiff/contrib/win95: renamed to contrib/win_dib. Added new
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Tiffile.cpp example of converting TIFF files into a DIB on Win32 as per
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bug 143.
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<FONT SIZE=+3>C</FONT>HANGES IN THE LZW COMPRESSION
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KIT:
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LZW compression kit synchronized with actual libtiff version.
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 TIFF home page.
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Last updated $Date: 2003/10/04 11:38:17 $.
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</BODY>
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</HTML>
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