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+CHANGE LOG for Independent JPEG Group's JPEG software

+

+

+Version 8d  15-Jan-2012

+-----------------------

+

+Add cjpeg -rgb option to create RGB JPEG files.

+Using this switch suppresses the conversion from RGB

+colorspace input to the default YCbCr JPEG colorspace.

+This feature allows true lossless JPEG coding of RGB color images.

+The recommended command for this purpose is currently

+cjpeg -rgb -block 1 -arithmetic.

+SmartScale capable decoder (introduced with IJG JPEG 8) required.

+Thank to Michael Koch for the initial suggestion.

+

+Add option to disable the region adjustment in the transupp crop code.

+Thank to Jeffrey Friedl for the suggestion.

+

+Thank to Richard Jones and Edd Dawson for various minor corrections.

+

+Thank to Akim Demaille for configure.ac cleanup.

+

+

+Version 8c  16-Jan-2011

+-----------------------

+

+Add option to compression library and cjpeg (-block N) to use

+different DCT block size.

+All N from 1 to 16 are possible.  Default is 8 (baseline format).

+Larger values produce higher compression,

+smaller values produce higher quality.

+SmartScale capable decoder (introduced with IJG JPEG 8) required.

+

+

+Version 8b  16-May-2010

+-----------------------

+

+Repair problem in new memory source manager with corrupt JPEG data.

+Thank to Ted Campbell and Samuel Chun for the report.

+

+Repair problem in Makefile.am test target.

+Thank to anonymous user for the report.

+

+Support MinGW installation with automatic configure.

+Thank to Volker Grabsch for the suggestion.

+

+

+Version 8a  28-Feb-2010

+-----------------------

+

+Writing tables-only datastreams via jpeg_write_tables works again.

+

+Support 32-bit BMPs (RGB image with Alpha channel) for read in cjpeg.

+Thank to Brett Blackham for the suggestion.

+

+Improve accuracy in floating point IDCT calculation.

+Thank to Robert Hooke for the hint.

+

+

+Version 8  10-Jan-2010

+----------------------

+

+jpegtran now supports the same -scale option as djpeg for "lossless" resize.

+An implementation of the JPEG SmartScale extension is required for this

+feature.  A (draft) specification of the JPEG SmartScale extension is

+available as a contributed document at ITU and ISO.  Revision 2 or later

+of the document is required (latest document version is Revision 3).

+The SmartScale extension will enable more features beside lossless resize

+in future implementations, as described in the document (new compression

+options).

+

+Add sanity check in BMP reader module to avoid cjpeg crash for empty input

+image (thank to Isaev Ildar of ISP RAS, Moscow, RU for reporting this error).

+

+Add data source and destination managers for read from and write to

+memory buffers.  New API functions jpeg_mem_src and jpeg_mem_dest.

+Thank to Roberto Boni from Italy for the suggestion.

+

+

+Version 7  27-Jun-2009

+----------------------

+

+New scaled DCTs implemented.

+djpeg now supports scalings N/8 with all N from 1 to 16.

+cjpeg now supports scalings 8/N with all N from 1 to 16.

+Scaled DCTs with size larger than 8 are now also used for resolving the

+common 2x2 chroma subsampling case without additional spatial resampling.

+Separate spatial resampling for those kind of files is now only necessary

+for N>8 scaling cases.

+Furthermore, separate scaled DCT functions are provided for direct resolving

+of the common asymmetric subsampling cases (2x1 and 1x2) without additional

+spatial resampling.

+

+cjpeg -quality option has been extended for support of separate quality

+settings for luminance and chrominance (or in general, for every provided

+quantization table slot).

+New API function jpeg_default_qtables() and q_scale_factor array in library.

+

+Added -nosmooth option to cjpeg, complementary to djpeg.

+New variable "do_fancy_downsampling" in library, complement to fancy

+upsampling.  Fancy upsampling now uses direct DCT scaling with sizes

+larger than 8.  The old method is not reversible and has been removed.

+

+Support arithmetic entropy encoding and decoding.

+Added files jaricom.c, jcarith.c, jdarith.c.

+

+Straighten the file structure:

+Removed files jidctred.c, jcphuff.c, jchuff.h, jdphuff.c, jdhuff.h.

+

+jpegtran has a new "lossless" cropping feature.

+

+Implement -perfect option in jpegtran, new API function

+jtransform_perfect_transform() in transupp. (DP 204_perfect.dpatch)

+

+Better error messages for jpegtran fopen failure.

+(DP 203_jpegtran_errmsg.dpatch)

+

+Fix byte order issue with 16bit PPM/PGM files in rdppm.c/wrppm.c:

+according to Netpbm, the de facto standard implementation of the PNM formats,

+the most significant byte is first. (DP 203_rdppm.dpatch)

+

+Add -raw option to rdjpgcom not to mangle the output.

+(DP 205_rdjpgcom_raw.dpatch)

+

+Make rdjpgcom locale aware. (DP 201_rdjpgcom_locale.dpatch)

+

+Add extern "C" to jpeglib.h.

+This avoids the need to put extern "C" { ... } around #include "jpeglib.h"

+in your C++ application.  Defining the symbol DONT_USE_EXTERN_C in the

+configuration prevents this. (DP 202_jpeglib.h_c++.dpatch)

+

+

+Version 6b  27-Mar-1998

+-----------------------

+

+jpegtran has new features for lossless image transformations (rotation

+and flipping) as well as "lossless" reduction to grayscale.

+

+jpegtran now copies comments by default; it has a -copy switch to enable

+copying all APPn blocks as well, or to suppress comments.  (Formerly it

+always suppressed comments and APPn blocks.)  jpegtran now also preserves

+JFIF version and resolution information.

+

+New decompressor library feature: COM and APPn markers found in the input

+file can be saved in memory for later use by the application.  (Before,

+you had to code this up yourself with a custom marker processor.)

+

+There is an unused field "void * client_data" now in compress and decompress

+parameter structs; this may be useful in some applications.

+

+JFIF version number information is now saved by the decoder and accepted by

+the encoder.  jpegtran uses this to copy the source file's version number,

+to ensure "jpegtran -copy all" won't create bogus files that contain JFXX

+extensions but claim to be version 1.01.  Applications that generate their

+own JFXX extension markers also (finally) have a supported way to cause the

+encoder to emit JFIF version number 1.02.

+

+djpeg's trace mode reports JFIF 1.02 thumbnail images as such, rather

+than as unknown APP0 markers.

+

+In -verbose mode, djpeg and rdjpgcom will try to print the contents of

+APP12 markers as text.  Some digital cameras store useful text information

+in APP12 markers.

+

+Handling of truncated data streams is more robust: blocks beyond the one in

+which the error occurs will be output as uniform gray, or left unchanged

+if decoding a progressive JPEG.  The appearance no longer depends on the

+Huffman tables being used.

+

+Huffman tables are checked for validity much more carefully than before.

+

+To avoid the Unisys LZW patent, djpeg's GIF output capability has been

+changed to produce "uncompressed GIFs", and cjpeg's GIF input capability

+has been removed altogether.  We're not happy about it either, but there

+seems to be no good alternative.

+

+The configure script now supports building libjpeg as a shared library

+on many flavors of Unix (all the ones that GNU libtool knows how to

+build shared libraries for).  Use "./configure --enable-shared" to

+try this out.

+

+New jconfig file and makefiles for Microsoft Visual C++ and Developer Studio.

+Also, a jconfig file and a build script for Metrowerks CodeWarrior

+on Apple Macintosh.  makefile.dj has been updated for DJGPP v2, and there

+are miscellaneous other minor improvements in the makefiles.

+

+jmemmac.c now knows how to create temporary files following Mac System 7

+conventions.

+

+djpeg's -map switch is now able to read raw-format PPM files reliably.

+

+cjpeg -progressive -restart no longer generates any unnecessary DRI markers.

+

+Multiple calls to jpeg_simple_progression for a single JPEG object

+no longer leak memory.

+

+

+Version 6a  7-Feb-96

+--------------------

+

+Library initialization sequence modified to detect version mismatches

+and struct field packing mismatches between library and calling application.

+This change requires applications to be recompiled, but does not require

+any application source code change.

+

+All routine declarations changed to the style "GLOBAL(type) name ...",

+that is, GLOBAL, LOCAL, METHODDEF, EXTERN are now macros taking the

+routine's return type as an argument.  This makes it possible to add

+Microsoft-style linkage keywords to all the routines by changing just

+these macros.  Note that any application code that was using these macros

+will have to be changed.

+

+DCT coefficient quantization tables are now stored in normal array order

+rather than zigzag order.  Application code that calls jpeg_add_quant_table,

+or otherwise manipulates quantization tables directly, will need to be

+changed.  If you need to make such code work with either older or newer

+versions of the library, a test like "#if JPEG_LIB_VERSION >= 61" is

+recommended.

+

+djpeg's trace capability now dumps DQT tables in natural order, not zigzag

+order.  This allows the trace output to be made into a "-qtables" file

+more easily.

+

+New system-dependent memory manager module for use on Apple Macintosh.

+

+Fix bug in cjpeg's -smooth option: last one or two scanlines would be

+duplicates of the prior line unless the image height mod 16 was 1 or 2.

+

+Repair minor problems in VMS, BCC, MC6 makefiles.

+

+New configure script based on latest GNU Autoconf.

+

+Correct the list of include files needed by MetroWerks C for ccommand().

+

+Numerous small documentation updates.

+

+

+Version 6  2-Aug-95

+-------------------

+

+Progressive JPEG support: library can read and write full progressive JPEG

+files.  A "buffered image" mode supports incremental decoding for on-the-fly

+display of progressive images.  Simply recompiling an existing IJG-v5-based

+decoder with v6 should allow it to read progressive files, though of course

+without any special progressive display.

+

+New "jpegtran" application performs lossless transcoding between different

+JPEG formats; primarily, it can be used to convert baseline to progressive

+JPEG and vice versa.  In support of jpegtran, the library now allows lossless

+reading and writing of JPEG files as DCT coefficient arrays.  This ability

+may be of use in other applications.

+

+Notes for programmers:

+* We changed jpeg_start_decompress() to be able to suspend; this makes all

+decoding modes available to suspending-input applications.  However,

+existing applications that use suspending input will need to be changed

+to check the return value from jpeg_start_decompress().  You don't need to

+do anything if you don't use a suspending data source.

+* We changed the interface to the virtual array routines: access_virt_array

+routines now take a count of the number of rows to access this time.  The

+last parameter to request_virt_array routines is now interpreted as the

+maximum number of rows that may be accessed at once, but not necessarily

+the height of every access.

+

+

+Version 5b  15-Mar-95

+---------------------

+

+Correct bugs with grayscale images having v_samp_factor > 1.

+

+jpeg_write_raw_data() now supports output suspension.

+

+Correct bugs in "configure" script for case of compiling in

+a directory other than the one containing the source files.

+

+Repair bug in jquant1.c: sometimes didn't use as many colors as it could.

+

+Borland C makefile and jconfig file work under either MS-DOS or OS/2.

+

+Miscellaneous improvements to documentation.

+

+

+Version 5a  7-Dec-94

+--------------------

+

+Changed color conversion roundoff behavior so that grayscale values are

+represented exactly.  (This causes test image files to change.)

+

+Make ordered dither use 16x16 instead of 4x4 pattern for a small quality

+improvement.

+

+New configure script based on latest GNU Autoconf.

+Fix configure script to handle CFLAGS correctly.

+Rename *.auto files to *.cfg, so that configure script still works if

+file names have been truncated for DOS.

+

+Fix bug in rdbmp.c: didn't allow for extra data between header and image.

+

+Modify rdppm.c/wrppm.c to handle 2-byte raw PPM/PGM formats for 12-bit data.

+

+Fix several bugs in rdrle.c.

+

+NEED_SHORT_EXTERNAL_NAMES option was broken.

+

+Revise jerror.h/jerror.c for more flexibility in message table.

+

+Repair oversight in jmemname.c NO_MKTEMP case: file could be there

+but unreadable.

+

+

+Version 5  24-Sep-94

+--------------------

+

+Version 5 represents a nearly complete redesign and rewrite of the IJG

+software.  Major user-visible changes include:

+  * Automatic configuration simplifies installation for most Unix systems.

+  * A range of speed vs. image quality tradeoffs are supported.

+    This includes resizing of an image during decompression: scaling down

+    by a factor of 1/2, 1/4, or 1/8 is handled very efficiently.

+  * New programs rdjpgcom and wrjpgcom allow insertion and extraction

+    of text comments in a JPEG file.

+

+The application programmer's interface to the library has changed completely.

+Notable improvements include:

+  * We have eliminated the use of callback routines for handling the

+    uncompressed image data.  The application now sees the library as a

+    set of routines that it calls to read or write image data on a

+    scanline-by-scanline basis.

+  * The application image data is represented in a conventional interleaved-

+    pixel format, rather than as a separate array for each color channel.

+    This can save a copying step in many programs.

+  * The handling of compressed data has been cleaned up: the application can

+    supply routines to source or sink the compressed data.  It is possible to

+    suspend processing on source/sink buffer overrun, although this is not

+    supported in all operating modes.

+  * All static state has been eliminated from the library, so that multiple

+    instances of compression or decompression can be active concurrently.

+  * JPEG abbreviated datastream formats are supported, ie, quantization and

+    Huffman tables can be stored separately from the image data.

+  * And not only that, but the documentation of the library has improved

+    considerably!

+

+

+The last widely used release before the version 5 rewrite was version 4A of

+18-Feb-93.  Change logs before that point have been discarded, since they

+are not of much interest after the rewrite.