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Version 1.6.0beta28 [August 29, 2012]
  Unknown handling fixes and clean up. This adds more correct option
    control of the unknown handling, corrects the pre-existing bug where
    the per-chunk 'keep' setting is ignored and makes it possible to skip
    IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
    There is a new test program, test-unknown.c, which is a work in progress
    (not currently part of the test suite).  Comments in the header files now
    explain how the unknown handling works.
  Allow fine grain control of unknown chunk APIs. This change allows
    png_set_keep_unknown_chunks() to be turned off if not required and causes
    both read and write to behave appropriately (on read this is only possible
    if the user callback is used to handle unknown chunks).  The change
    also removes the support for storing unknown chunks in the info_struct
    if the only unknown handling enabled is via the callback, allowing libpng
    to be configured with callback reading and none of the unnecessary code.
  Corrected fix for unknown handling in pngtest. This reinstates the
    libpng handling of unknown chunks other than vpAg and sTER (including
    unsafe-to-copy chunks which were dropped before) and eliminates the
    repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
    (so the chunks are where libpng would put them).
  Added "tunknown" test and corrected a logic error in png_handle_unknown()
    when SAVE support is absent.  Moved the shell test scripts for
    contrib/libtests from the libpng top directory to contrib/libtests.
    png_handle_unknown() must always read or skip the chunk, if
    SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set
    a user callback an unknown chunk will not be read, leading to a read
    error, which was revealed by the "tunknown" test.
  Cleaned up and corrected ICC profile handling.
    contrib/libtests/makepng: corrected 'rgb' and 'gray' cases.  profile_error
    messages could be truncated; made a correct buffer size calculation and
    adjusted pngerror.c appropriately. png_icc_check_* checking improved;
    changed the functions to receive the correct color type of the PNG on read
    or write and check that it matches the color space of the profile (despite
    what the comments said before, there is danger in assuming the app will
    cope correctly with an RGB profile on a grayscale image and, since it
    violates the PNG spec, allowing it is certain to produce inconsistent
    app behavior and might even cause app crashes.) Check that profiles
    contain the tags needed to process the PNG (tags all required by the ICC
    spec). Removed unused PNG_STATIC from pngpriv.h.

Version 1.6.0beta29 [September 4, 2012]
  Fixed the simplified API example programs to add the *colormap parameter
    to several of he API and improved the error message if the version field
    is not set.
  Added contrib/examples/* to the *.zip and *.7z distributions.
  Updated simplified API synopses and description of the png_image structure
    in the manual.
  Made makepng and pngtest produce identical PNGs, add "--relaxed" option
    to pngtest. The "--relaxed" option turns off the benign errors that are
    enabled by default in pre-RC builds. makepng can now write ICC profiles
    where the length has not been extended to a multiple of 4, and pngtest
    now intercepts all libpng errors, allowing the previously-introduced
    "--strict test" on no warnings to actually work.
  Improved ICC profile handling including cHRM chunk generation and fixed
    Cygwin+MSVC build errors. The ICC profile handling now includes more
    checking.  Several errors that caused rejection of the profile are now
    handled with a warning in such a way that the invalid profiles will be
    read by default in release (but not pre-RC) builds but will not be
    written by default.  The easy part of handling the cHRM chunk is written,
    where the ICC profile contains the required data.  The more difficult
    part plus guessing a gAMA value requires code to pass selected RGB values
    through the profile.

Version 1.6.0beta30 [October 24, 2012]
  Changed ICC profile matrix/vector types to not depend on array type rules.
    By the ANSI-C standard the new types should be identical to the previous
    versions, and all known versions of gcc tested with the previous versions
    except for GCC-4.2.1 work with this version.  The change makes the ANSI-C
    rule that const applied to an array of elements applies instead to the
    elements in the array moot by explicitly applying const to the base
    elements of the png_icc_matrix and png_icc_vector types. The accidental
    (harmless) 'const' previously applied to the parameters of two of the
    functions have also been removed.
  Added a work around for GCC 4.2 optimization bug.
  Marked the broken (bad white point) original HP sRGB profiles correctly and
    correct comments.
  Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7
  Use /MDd for vstudio debug builds. Also added pngunkown to the vstudio
    builds, fixed build errors and corrected a minor exit code error in
    pngvalid if the 'touch' file name is invalid.
  Add updated WARNING file to projects/vstudio from libpng 1.5/vstudio
  Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
    pngrtran.c (Domani Hannes).

Version 1.6.0beta31 [November 1, 2012]
  Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
  Made pngvalid so that it will build outside the libpng source tree.
  Made builds -DPNG_NO_READ_GAMMA compile (the unit tests still fail).
  Made PNG_NO_READ_GAMMA switch off interfaces that depend on READ_GAMMA.
    Prior to 1.6.0 switching off READ_GAMMA did unpredictable things to the
    interfaces that use it (specifically, png_do_background in 1.4 would
    simply display composite for grayscale images but do composition
    with the incorrect arithmetic for color ones). In 1.6 the semantic
    of -DPNG_NO_READ_GAMMA is changed to simply disable any interface that
    depends on it; this obliges people who set it to consider whether they
    really want it off if they happen to use any of the interfaces in
    question (typically most users who disable it won't).
  Fixed GUIDs in projects/vstudio. Some were duplicated or missing,
    resulting in VS2010 having to update the files.
  Removed non-working ICC profile support code that was mostly added to
    libpng-1.6.0beta29 and beta30. There was too much code for too little
    gain; implementing full ICC color correction may be desireable but is left
    up to applications.

Version 1.6.0beta32 [November 25, 2012]
  Fixed an intermittent SEGV in pngstest due to an uninitialized array element.
  Added the ability for contrib/libtests/makepng.c to make a PNG with just one
    color. This is useful for debugging pngstest color inaccuracy reports.
  Fixed error checking in the simplified write API (Olaf van der Spek)
  Made png_user_version_check() ok to use with libpng version 1.10.x and later.

Version 1.6.0beta33 [December 15, 2012]
  Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX)
    that causes the MALLOC_MAX limit not to work (John Bowler)
  Change png_warning() to png_app_error() in pngwrite.c and comment the
    fall-through condition.
  Change png_warning() to png_app_warning() in png_write_tRNS().
  Rearranged the ARM-NEON optimizations: Isolated the machine specific code
    to the hardware subdirectory and added comments to pngrutil.c so that
    implementors of other optimizations know what to do.
  Fixed cases of unquoted DESTDIR in Makefile.am