9
<FONT FACE="Helvetica, Arial, Sans">
10
<FONT FACE="Helvetica, Arial, Sans">
13
<B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B>
17
<HR SIZE=4 WIDTH=65% ALIGN=left>
18
<B>Current Version</B>: v3.6.0<BR>
19
<B>Previous Version</B>: <A HREF=v3.5.7.html>v3.5.7</a><BR>
20
<B>Master FTP Site</B>: <A HREF="ftp://ftp.remotesensing.org/pub/libtiff">
21
ftp.remotesensing.org</a>, directory pub/libtiff</A><BR>
22
<B>Master HTTP Site</B>: <A HREF="http://www.remotesensing.org/libtiff">
23
http://www.remotesensing.org/libtiff</a>
24
<HR SIZE=4 WIDTH=65% ALIGN=left>
28
This document describes the changes made to the software between the
29
<I>previous</I> and <I>current</I> versions (see above).
30
If you don't find something listed here, then it was not done in this
31
timeframe, or it was not considered important enough to be mentioned.
32
The following information is located here:
34
<LI><A HREF="#hightlights">Major Changes</A>
35
<LI><A HREF="#configure">Changes in the software configuration</A>
36
<LI><A HREF="#libtiff">Changes in libtiff</A>
37
<LI><A HREF="#tools">Changes in the tools</A>
38
<LI><A HREF="#contrib">Changes in the contrib area</A>
39
<LI><A HREF="#lzwkit">Changes in the LZW compression kit</A>
42
<P><HR WIDTH=65% ALIGN=left>
44
<!--------------------------------------------------------------------------->
46
<A NAME="highlights"><B><FONT SIZE=+3>M</FONT>AJOR CHANGES:</B></A>
49
<li> New utility <a href=./man/raw2tiff.1.html>raw2tiff</a>
50
for converting raw rasters into TIFF files.
51
<li> Lots of new <a href=./man/tiff2ps.1.html>tiff2ps</a> options.
52
<li> Lots of new <a href=./man/fax2tiff.1.html>fax2tiff</a> options.
53
<li> Lots of bug fixes for LZW, JPEG and OJPEG compression.
56
<h3>Custom Tag Support</h3>
58
The approach to extending libtiff with custom tags has changed radically.
59
Previously, all internally supported TIFF tags had a place in the
60
private TIFFDirectory structure within libtiff to hold the values (if read),
61
and a "field number" (ie. FIELD_SUBFILETYPE) used to identify that tag.
62
However, every time a new tag was added to the core, the size of the
63
TIFFDirectory structure would changing, breaking any dynamically linked
64
software that used the private data structures.<p>
66
Also, any tag not recognised
67
by libtiff would not be read and accessable to applications without some
68
fairly complicated work on the applications part to pre-register the tags
69
as exemplified by the support for "Geo"TIFF tags by libgeotiff layered on
72
Amoung other things this approach required the extension code
73
to access the private libtiff structures ... which made the higher level
74
non-libtiff code be locked into a specific version of libtiff at compile time.
75
This caused no end of bug reports!<p>
77
The new approach is for libtiff to read all tags from TIFF files. Those that
78
aren't recognised as "core tags" (those having an associated FIELD_ value,
79
and place for storage in the TIFFDirectory structure) are now read into a
80
dynamic list of extra tags (td_customValues in TIFFDirectory). When a new
81
tag code is encountered for the first time in a given TIFF file, a new
82
anonymous tag definition is created for the tag in the tag definition list.
83
The type, and some other metadata is worked out from the instance encountered.
84
These fields are known as "custom tags". <p>
86
Custom tags can be set and fetched normally using TIFFSetField() and
87
TIFFGetField(), and appear pretty much like normal tags to application code.
88
However, they have no impact on internal libtiff processing (such as
89
compression). Some utilities, such as tiffcp will now copy these custom
90
tags to the new output files. <p>
92
As well as the internal work with custom tags, new C API entry points
93
were added so that extension libraries, such as libgeotiff, could
94
define new tags more easily without accessing internal data structures.
95
Because tag handling of extension tags is done via the "custom fields"
96
mechanism as well, the definition provided externally mostly serves to provide
97
a meaningful name for the tag.
99
The addition of "custom tags" and the altered approach to extending libtiff
100
with externally defined tags is the primary reason for the shift to the
101
3.6.x version number from 3.5.x.<p>
103
<P><HR WIDTH=65% ALIGN=left>
104
<!--------------------------------------------------------------------------->
106
<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
109
<li> configure, config.site: Fix for large files (>2GiB) support. New
110
option in the config.site: LARGEFILE="yes". Should be enougth for the large
113
<li> configure: Set -DPIXARLOG_SUPPORT option along with -DZIP_SUPPORT.
115
<li> html/Makefile.in: Updated to use groffhtml for generating html pages
118
<li> configure, libtiff/Makefile.in: Added SCO OpenServer 5.0.6 support
119
from John H. DuBois III.
121
<li> libtiff/{Makefile.vc, libtiff.def}: Missed declarations added.
123
<li> libtiff/Makefile.in, tools/Makefile.in: Shared library will not be
124
stripped when installing, utility binaries will do be stripped. As per bug 93.
126
<li> man/Makefile.in: Patch DESTDIR handling as per bug 95.
128
<li> configure: OpenBSD changes for Sparc64 and DSO version as per bug 96.
130
<li> config.site/configure: added support for OJPEG=yes option to enable
131
OJPEG support from config.site.
133
<li> config.guess, config.sub: Updated from ftp.gnu.org/pub/config.
135
<li> configure: Modify CheckForBigEndian so it can work in a cross
138
<li> configure, libtiff/Makefile.in: Changes for building on MacOS 10.1
141
<li> html/Makefile.in: added missing images per bug 92.
143
<li> port/Makefile.in: fixed clean target per bug 92.
146
<P><HR WIDTH=65% ALIGN=left>
148
<!--------------------------------------------------------------------------->
150
<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A>
154
<li> libtiff/tif_getimage.c: New function <A
155
HREF="./man/TIFFReadRGBAImage.3t.html">TIFFReadRGBAImageOriented()</A>
156
implemented to retrieve raster array with user-specified origin position.
158
<li> libtiff/tif_fax3.c: Fix wrong line numbering.
160
<li> libtiff/tif_dirread.c: Check field counter against number of fields.
162
<li> Store a list of opened IFD to prevent directory looping.
164
<li> libtiff/tif_jpeg.c: modified segment_height calculation to always
165
be a full height tile for tiled images. Also changed error to just
168
<li> libtiff/tif_lzw.c: fixed so that decoder state isn't allocated till
169
LZWSetupDecode(). Needed to read LZW files in "r+" mode.
171
<li> libtiff/tif_dir.c: fixed up the tif_postdecode settings responsible
172
for byte swapping complex image data.
174
<li> libtiff/tif_open.c: Removed error if opening a compressed file
175
in update mode bug (198).
177
<li> libtiff/tif_write.c: TIFFWriteCheck() now fails if the image is
178
a pre-existing compressed image. That is, image writing to pre-existing
179
compressed images is not allowed.
181
<li> html/man/*.html: Web pages regenerated from man pages.
183
<li> libtiff/tif_jpeg.c: Hack to ensure that "boolean" is defined properly
184
on Windows so as to avoid the structure size mismatch error from libjpeg
187
<li> libtiff/tiff.h: #ifdef USING_VISUALAGE around previous Visual Age
188
AIX porting hack as it screwed up gcc. (bug 39)
190
<li> libtiff/tiff.h: added COMPRESSION_JP2000 (34712) for LEAD tools
193
<li> libtiff/tif_dirread.c: Another fix for the fetching SBYTE arrays
194
by the TIFFFetchByteArray() function. (bug 52)
196
<li> libtiff/tif_dirread.c: Expand v[2] to v[4] in TIFFFetchShortPair()
199
<li> libtiff/tif_lzw.c: Additional consistency checking added in
200
LZWDecode() and LZWDecodeCompat() fixing bugs 190 and 100.
202
<li> libtiff/tif_lzw.c: Added check for valid code lengths in LZWDecode()
203
and LZWDecodeCompat(). Fixes bug 115.
205
<li> tif_getimage.c: Ensure that TIFFRGBAImageBegin() returns the
206
return code from the underlying pick function as per bug 177.
208
<li> libtiff/{tif_jpeg.c,tif_strip.c,tif_print.c}: Hacked tif_jpeg.c to
209
fetch TIFFTAG_YCBCRSUBSAMPLING from the jpeg data stream if it isn't
210
present in the tiff tags as per bug 168.
212
<li> libtiff/tif_jpeg.c: Fixed problem with setting of nrows in
213
JPEGDecode() as per bug 129.
215
<li> libtiff/tif_read.c, libtiff/tif_write.c: TIFFReadScanline() and
216
TIFFWriteScanline() now set tif_row explicitly in case the codec has
217
fooled with the value as per bug 129.
219
<li> libtiff/tif_ojpeg.c: Major upgrade from Scott. Details in bug 156.
221
<li> libtiff/tif_open.c: Pointers to custom procedures
222
in TIFFClientOpen() are checked to be not NULL-pointers.
224
<li> libtiff/tif_lzw.c: Assertions in LZWDecode and LZWDecodeCompat
225
replaced by warnings. Now libtiff should read corrupted LZW-compressed
226
files by skipping bad strips as per bug 100.
228
<li> libtiff/: tif_dirwrite.c, tif_write.c, tiffio.h:
229
<a href=./man/TIFFWriteDirectory.3t.html>TIFFCheckpointDirectory()</a>
230
routine added as per bug 124. The
231
<a href=./man/TIFFWriteDirectory.3t.html>TIFFWriteDirectory</a>
232
man page discusses this new function as well as the related
233
<a href=./man/TIFFWriteDirectory.3t.html>TIFFRewriteDirectory()</a>.
235
<li> libtiff/: tif_codec.c, tif_compress.c, tiffiop.h, tif_getimage.c:
237
additional members tif->tif_decodestatus and tif->tif_encodestatus
238
for correct handling of unconfigured codecs (we should not try to read
239
data or to define data size without correct codecs). See bug 119.
241
<li> tif_dirread.c: avoid div-by-zero if rowbytes is zero in chop func as
244
<li> libtiff/: tiff.h, tif_dir.c, tif_dir.h, tif_dirinfo.c, tif_dirread.c,
245
tif_dirwrite.c: Dwight Kelly added get/put code for new tag XMLPACKET as
246
defined in Adobe XMP Technote. Added missing INKSET tag value from TIFF 6.0
247
spec INKSET_MULTIINK (=2). Added missing tags from Adobe TIFF technotes:
248
CLIPPATH, XCLIPPATHUNITS, YCLIPPATHUNITS, OPIIMAGEID, OPIPROXY and
249
INDEXED. Added PHOTOMETRIC tag value from TIFF technote 4 ICCLAB (=9).
251
<li> libtiff/tif_getimage.c: Additional check for supported codecs added in
252
TIFFRGBAImageOK, TIFFReadRGBAImage, TIFFReadRGBAStrip and TIFFReadRGBATile now
253
use TIFFRGBAImageOK before reading a per bug 110.
255
<li> libtiff/: tif_dir.c, tif_dir.h, tif_dirinfo.c, tif_dirread.c,
256
tif_dirwrite.c: Added routine
257
<a href=./man/TIFFDataWidth.3t.html>TIFFDataWidth</a> for determining
258
TIFFDataType sizes instead of working with tiffDataWidth array
259
directly as per bug 109.
261
<li>libtiff/: tif_dirinfo.c, tif_dirwrite.c: Added possibility to
262
read broken TIFFs with LONG type used for TIFFTAG_COMPRESSION,
263
TIFFTAG_BITSPERSAMPLE, TIFFTAG_PHOTOMETRIC as per bug 99.
265
<li> libtiff/{tiff.h,tif_fax3.c}: Add support for __arch64__ as per bug 94.
267
<li> libtiff/tif_read.c: Fixed TIFFReadEncodedStrip() to fail if the
268
decodestrip function returns anything not greater than zero as per bug 97.
270
<li> libtiff/tif_jpeg.c: fixed computation of segment_width for
271
tiles files to avoid error about it not matching the
272
cinfo.d.image_width values ("JPEGPreDecode: Improper JPEG strip/tile
273
size.") for ITIFF files. Apparently the problem was incorporated since
274
3.5.5, presumably during the OJPEG/JPEG work recently.
276
<li> libtiff/tif_getimage.c: If DEFAULT_EXTRASAMPLE_AS_ALPHA is 1
277
(defined in tiffconf.h - 1 by default) then the RGBA interface
278
will assume that a fourth extra sample is ASSOCALPHA if the
279
EXTRASAMPLE value isn't set for it. This changes the behaviour of
280
the library, but makes it work better with RGBA files produced by
281
lots of applications that don't mark the alpha values properly.
282
As per bugs 93 and 65.
284
<li> libtiff/tif_jpeg.c: allow jpeg data stream sampling values to
285
override those from tiff directory. This makes this work with
286
ImageGear generated files.
290
<P><HR WIDTH=65% ALIGN=left>
292
<!-------------------------------------------------------------------------->
294
<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A>
298
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Added page size setting
299
when creating PS Level 2.
301
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Fixed PS comment emitted when
302
FlateDecode is being used.
304
<li> <a href=./man/tiffsplit.1.html>tiffsplit</a>: increased the maximum
305
number of pages that can be split.
307
<li> <a href=./man/raw2tiff.1.html>raw2tiff</a>: Added option `-p' to
308
explicitly select color space of input image data.
310
<li> <a href=./man/tiffmedian.1.html>tiffmedian</a>: Suppiort for large
313
<li> <a href=./man/ppm2tiff.1.html>ppm2tiff</a>: Fixed possible endless loop.
315
<li> <a href=./man/tiff2rgba.1.html>tiff2rgba</a>: Switched to use
316
<A HREF="./man/TIFFReadRGBAImage.3t.html">TIFFReadRGBAImageOriented()</A>
317
instead of <A HREF="./man/TIFFReadRGBAImage.3t.html">TIFFReadRGBAImage()</A>.
319
<li> <a href=./man/tiffcmp.1.html>tiffcmp</a>: Fixed problem with unused data
320
comparing (bug 349). `-z' option now can be used to set the number of reported
323
<li> <a href=./man/tiffcp.1.html>tiffcp</a>: Added possibility to specify
324
value -1 to -r option to get the entire image as one strip (bug 343).
326
<li> <a href=./man/tiffcp.1.html>tiffcp</a>: Set the correct RowsPerStrip
327
and PageNumber values (bug 343).
329
<li> <a href=./man/fax2tiff.1.html>fax2tiff</a>: Page numbering fixed (bug
332
<li> <a href=./man/ppm2tiff.1.html>ppm2tiff</a>: PPM header parser improved:
333
now able to skip comments.
335
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Force deadzone printing when
336
EPS output specified (bug 325).
338
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Add ability to generate
339
PS Level 3. It basically allows one to use the /flateDecode filter for ZIP
340
compressed TIFF images. Patch supplied by Tom Kacvinsky (bug 328).
342
<li> <a href=./man/tiffcp.1.html>tiffcp</a>: Fixed problem with colorspace
343
conversion for JPEG encoded images (bugs 23 and 275)
345
<li> <a href=./man/fax2tiff.1.html>fax2tiff</a>: Applied patch from
346
Julien Gaulmin. More switches for fax2tiff tool for better control
347
of input and output (bugs 272 and 293).
349
<li> <a href=./man/raw2tiff.1.html>raw2tiff</a>:
350
New utility for turning raw raster images into TIFF files
351
written by Andrey Kiselev.
353
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>:
354
Sebastian Eken provided patches (bug 200) to add new these new
357
<li> <b>-b #</b>: for a bottom margin of # inches
358
<li> <b>-c</b>: center image
359
<li> <b>-l #</b>: for a left margin of # inches
360
<li> <b>-r</b>: rotate the image by 180 degrees
363
Also, new features merged with code for shrinking/overlapping.
365
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Don't emit BeginData/EndData
366
DSC comments since we are unable to properly include the amount to skip
369
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Added workaround for some
370
software that may crash when last strip of image contains fewer number
371
of scanlines than specified by the `/Height' variable as per bug 164.
373
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: Patch from John Williams to add new
374
functionality for tiff2ps utility splitting long images in several pages as
375
per bug 142. New switches:
377
<li> <b>-H #</b>: split image if height is more than # inches
378
<li> <b>-L #</b>: overLap split images by # inches
381
<li> <a href=./man/tiff2ps.1.html>tiff2ps</a>: New commandline
382
switches to override resolution units obtained from the input file per bug 131:
384
<li> <b>-x</b>: override resolution units as centimeters
385
<li> <b>-y</b>: override resolution units as inches
388
<li> <a href=./man/fax2tiff.1.html>fax2tiff</a>: Updated to reflect
389
latest changes in libtiff per bug 125.
391
<li> tiff2ps: Division by zero fixed as per bug 88.
393
<li> <a href=./man/tiffcp.1.html>tiffcp<a>:
394
Added support for 'Orientation' tag.
396
<li> <a href=./man/tiffdump.1.html>tiffdump</a>:
397
include TIFFTAG_JPEGTABLES in tag list.
399
<li> tiffset: fix bug in error reporting.
403
<P><HR WIDTH=65% ALIGN=left>
405
<!--------------------------------------------------------------------------->
407
<A NAME="contrib"><B><FONT SIZE=+3>C</FONT>HANGES IN THE CONTRIB AREA:</B></A>
410
<li> Fixed distribution to include contrib/addtiffo/tif_ovrcache.{c,h}.
411
<li> libtiff/contrib/win95: renamed to contrib/win_dib. Added new
412
Tiffile.cpp example of converting TIFF files into a DIB on Win32 as per
417
<!--------------------------------------------------------------------------->
419
<A NAME="lzwkit"><B><FONT SIZE=+3>C</FONT>HANGES IN THE LZW COMPRESSION
423
<li> LZW compression kit synchronized with actual libtiff version.
427
<A HREF="index.html"><IMG SRC="images/back.gif"></A> TIFF home page.<BR>
431
Last updated $Date: 2003/10/04 11:38:17 $.