diff --git a/ANNOUNCE b/ANNOUNCE
index 674e3137..ee1ee687 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.53beta01 - January 31, 2015
+Libpng 1.2.53beta02 - February 5, 2015
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,41 +9,43 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.2.53beta01.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.53beta01.tar.gz
-   libpng-1.2.53beta01.tar.bz2
+   libpng-1.2.53beta02.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.53beta02.tar.gz
+   libpng-1.2.53beta02.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.53beta01-no-config.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.53beta01-no-config.tar.gz
-   libpng-1.2.53beta01-no-config.tar.bz2
+   libpng-1.2.53beta02-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.53beta02-no-config.tar.gz
+   libpng-1.2.53beta02-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1253b01.zip
-   lp1253b01.7z
-   lp1253b01.tar.bz2
+   lp1253b02.zip
+   lp1253b02.7z
+   lp1253b02.tar.bz2
 
 Project files
 
-   libpng-1.2.53beta01-project-netware.zip
-   libpng-1.2.53beta01-project-wince.zip
+   libpng-1.2.53beta02-project-netware.zip
+   libpng-1.2.53beta02-project-wince.zip
 
 Other information:
 
-   libpng-1.2.53beta01-README.txt
-   libpng-1.2.53beta01-KNOWNBUGS.txt
-   libpng-1.2.53beta01-LICENSE.txt
-   libpng-1.2.53beta01-Y2K-compliance.txt
-   libpng-1.2.53beta01-[previous version]-diff.txt
-   libpng-1.2.53beta01-*.asc (armored detached GPG signatures)
+   libpng-1.2.53beta02-README.txt
+   libpng-1.2.53beta02-KNOWNBUGS.txt
+   libpng-1.2.53beta02-LICENSE.txt
+   libpng-1.2.53beta02-Y2K-compliance.txt
+   libpng-1.2.53beta02-[previous version]-diff.txt
+   libpng-1.2.53beta02-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.2.52):
 
-version 1.2.53beta01 [RDATE%]
+version 1.2.53beta01 [omitted]
+
+version 1.2.53beta02 [%RDATE%]
   Issue a png_error() instead of a png_warning() when width is
     potentially too large for the architecture, in case the calling
     application has overridden the default 1,000,000-column limit
diff --git a/CHANGES b/CHANGES
index 9953144c..cb22be41 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2828,7 +2828,9 @@ version 1.2.52rc02 [November 17, 2014]
 version 1.0.62 and 1.2.52 [November 20, 2014]
   No changes.
 
-version 1.2.53beta01 [RDATE%]
+version 1.2.53beta01 [omitted]
+
+version 1.2.53beta02 [%RDATE%]
   Issue a png_error() instead of a png_warning() when width is
     potentially too large for the architecture, in case the calling
     application has overridden the default 1,000,000-column limit
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0ec25e7..383c510c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,7 +215,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng-config.in
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 0.${PNGLIB_RELEASE}.1.2.53beta01
+#   VERSION 0.${PNGLIB_RELEASE}.1.2.53beta02
     VERSION 0.${PNGLIB_RELEASE}.0
     SOVERSION 0
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/INSTALL b/INSTALL
index 71a1c34c..3da03289 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.53beta01 - January 31, 2015
+Installing libpng version 1.2.53beta02 - February 5, 2015
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -46,7 +46,7 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.53beta01" or "libpng12" and "zlib-1.2.3"
+might be called "libpng-1.2.53beta02" or "libpng12" and "zlib-1.2.3"
 or "zlib123") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
diff --git a/KNOWNBUG b/KNOWNBUG
index de370c52..1ffd4212 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.53beta01
+Known bugs in libpng version 1.2.53beta02
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
diff --git a/LICENSE b/LICENSE
index c46f7fc5..1bb58933 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.53beta01, January 31, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.53beta02, February 5, 2015, are
 Copyright (c) 2004, 2006-2014 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-January 31, 2015
+February 5, 2015
diff --git a/Makefile.am b/Makefile.am
index ce200d70..392fe02a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -89,7 +89,7 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.53beta01.txt pnggccrd.c pngvcrd.c
+	example.c libpng-1.2.53beta02.txt pnggccrd.c pngvcrd.c
 
 CLEANFILES= pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
diff --git a/Makefile.in b/Makefile.in
index 46620a67..4652d2be 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -637,7 +637,7 @@ EXTRA_DIST = \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.53beta01.txt pnggccrd.c pngvcrd.c
+	example.c libpng-1.2.53beta02.txt pnggccrd.c pngvcrd.c
 
 CLEANFILES = pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
diff --git a/README b/README
index 50a86ce8..e7ac5b18 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.53beta01 - January 31, 2015 (shared library 12.0)
+README for libpng version 1.2.53beta02 - February 5, 2015 (shared library 12.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -207,11 +207,11 @@ Files in this distribution:
        makefile.std     =>  Generic UNIX makefile (cc, creates static
                             libpng.a)
        makefile.elf     =>  Linux/ELF gcc makefile symbol versioning,
-                            creates libpng12.so.0.1.2.53beta01)
+                            creates libpng12.so.0.1.2.53beta02)
        makefile.linux   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.53beta01)
+                            libpng12.so.0.1.2.53beta02)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.53beta01, previously
+                            libpng12.so.0.1.2.53beta02, previously
                             used assembler code tuned for Intel MMX
                             platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static
@@ -236,12 +236,12 @@ Files in this distribution:
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.53beta01)
+                            (gcc, creates libpng12.so.0.1.2.53beta02)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.53beta01)
+                            (gcc, creates libpng12.so.0.1.2.53beta02)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.53beta01)
+                            (gcc, creates libpng12.so.0.1.2.53beta02)
        makefile.32sunu  =>  Sun Ultra 32-bit makefile
        makefile.64sunu  =>  Sun Ultra 64-bit makefile
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
diff --git a/Y2KINFO b/Y2KINFO
index 7b0c9ed7..09265445 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      January 31, 2015
+      February 5, 2015
 
       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
 
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.53beta01 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.53beta02 are Y2K compliant.  It is my belief that earlier
       versions were also Y2K compliant.
 
       Libpng only has three year fields.  One is a 2-byte unsigned integer
diff --git a/configure b/configure
index 75be4481..e7745e4e 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for libpng 1.2.53beta01.
+# Generated by GNU Autoconf 2.69 for libpng 1.2.53beta02.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -590,8 +590,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.2.53beta01'
-PACKAGE_STRING='libpng 1.2.53beta01'
+PACKAGE_VERSION='1.2.53beta02'
+PACKAGE_STRING='libpng 1.2.53beta02'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1331,7 +1331,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures libpng 1.2.53beta01 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.53beta02 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1401,7 +1401,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.2.53beta01:";;
+     short | recursive ) echo "Configuration of libpng 1.2.53beta02:";;
    esac
   cat <<\_ACEOF
 
@@ -1515,7 +1515,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.53beta01
+libpng configure 1.2.53beta02
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1938,7 +1938,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.2.53beta01, which was
+It was created by libpng $as_me 1.2.53beta02, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2801,7 +2801,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.2.53beta01'
+ VERSION='1.2.53beta02'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2917,7 +2917,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.2.53beta01
+PNGLIB_VERSION=1.2.53beta02
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=53
@@ -13123,7 +13123,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.2.53beta01, which was
+This file was extended by libpng $as_me 1.2.53beta02, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -13189,7 +13189,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.2.53beta01
+libpng config.status 1.2.53beta02
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 4ede3bc0..1ec7ce52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.53beta01], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.53beta02], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.53beta01
+PNGLIB_VERSION=1.2.53beta02
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=53
diff --git a/libpng-1.2.53beta01.txt b/libpng-1.2.53beta02.txt
similarity index 99%
rename from libpng-1.2.53beta01.txt
rename to libpng-1.2.53beta02.txt
index db87e409..d804d2ab 100644
--- a/libpng-1.2.53beta01.txt
+++ b/libpng-1.2.53beta02.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.53beta01 - January 31, 2015
+ libpng version 1.2.53beta02 - February 5, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.53beta01 - January 31, 2015
+ libpng versions 0.97, January 1998, through 1.2.53beta02 - February 5, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
 
@@ -878,7 +878,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.53beta01, not all possible expansions are supported.
+As of libpng version 1.2.53beta02, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3183,13 +3183,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIII. Y2K Compliance in libpng
 
-January 31, 2015
+February 5, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.53beta01 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.53beta02 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
diff --git a/libpng.3 b/libpng.3
index 0807c4d8..ab9ac696 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "January 31, 2015"
+.TH LIBPNG 3 "February 5, 2015"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.53beta01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.53beta02
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -410,7 +410,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.53beta01 - January 31, 2015
+ libpng version 1.2.53beta02 - February 5, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -421,7 +421,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.53beta01 - January 31, 2015
+ libpng versions 0.97, January 1998, through 1.2.53beta02 - February 5, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
 
@@ -1288,7 +1288,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.53beta01, not all possible expansions are supported.
+As of libpng version 1.2.53beta02, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3593,13 +3593,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIII. Y2K Compliance in libpng
 
-January 31, 2015
+February 5, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.53beta01 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.53beta02 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -3930,7 +3930,7 @@ the first widely used release:
  1.2.52rc01-02       13    10252  12.so.0.52[.0]
  1.0.62              10    10062  10.so.0.62[.0]
  1.2.52              13    10252  12.so.0.52[.0]
- 1.2.53beta01        13    10253  12.so.0.53[.0]
+ 1.2.53beta01-02     13    10253  12.so.0.53[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3986,7 +3986,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.53beta01 - January 31, 2015:
+Libpng version 1.2.53beta02 - February 5, 2015:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -4009,7 +4009,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.53beta01, January 31, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.53beta02, February 5, 2015, are
 Copyright (c) 2004,2006-2008 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -4108,7 +4108,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-January 31, 2015
+February 5, 2015
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index f02c95e5..a4a968c2 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "January 31, 2015"
+.TH LIBPNGPF 3 "February 5, 2015"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.53beta01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.53beta02
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index d1770b35..225c4abb 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "January 31, 2015"
+.TH PNG 5 "February 5, 2015"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index 83d836f1..086b6a32 100644
--- a/png.c
+++ b/png.c
@@ -17,7 +17,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_53beta01 Your_png_h_is_not_version_1_2_53beta01;
+typedef version_1_2_53beta02 Your_png_h_is_not_version_1_2_53beta02;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
@@ -724,13 +724,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #ifdef __STDC__
    return ((png_charp) PNG_STRING_NEWLINE \
-     "libpng version 1.2.53beta01 - January 31, 2015" PNG_STRING_NEWLINE \
+     "libpng version 1.2.53beta02 - February 5, 2015" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2014 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE);
 #else
-      return ((png_charp) "libpng version 1.2.53beta01 - January 31, 2015\
+      return ((png_charp) "libpng version 1.2.53beta02 - February 5, 2015\
       Copyright (c) 1998-2014 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
diff --git a/png.h b/png.h
index a85dbd8a..f37964ea 100644
--- a/png.h
+++ b/png.h
@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.53beta01 - January 31, 2015
+ * libpng version 1.2.53beta02 - February 5, 2015
  * Copyright (c) 1998-2014 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -10,7 +10,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.53beta01 - January 31, 2015: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.53beta02 - February 5, 2015: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -292,7 +292,7 @@
  *    1.2.52rc01-02           13    10252  12.so.0.52[.0]
  *    1.0.62                  10    10062  10.so.0.62[.0]
  *    1.2.52                  13    10252  12.so.0.52[.0]
- *    1.2.53beta01            13    10253  12.so.0.53[.0]
+ *    1.2.53beta01-02         13    10253  12.so.0.53[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -324,7 +324,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.53beta01, January 31, 2015, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.53beta02, February 5, 2015, are
  * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -436,13 +436,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    January 31, 2015
+ *    February 5, 2015
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.53beta01 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.53beta02 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -498,9 +498,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.53beta01"
+#define PNG_LIBPNG_VER_STRING "1.2.53beta02"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.53beta01 - January 31, 2015\n"
+   " libpng version 1.2.53beta02 - February 5, 2015\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -513,7 +513,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  01
+#define PNG_LIBPNG_VER_BUILD  02
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -1578,7 +1578,7 @@ struct png_struct_def
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_53beta01;
+typedef png_structp version_1_2_53beta02;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index 62976b7a..40b7778e 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.53beta01 - January 31, 2015
+ * libpng version 1.2.53beta02 - February 5, 2015
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
diff --git a/pngtest.c b/pngtest.c
index 92f6dab7..3aa7d2f5 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1702,4 +1702,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_53beta01 your_png_h_is_not_version_1_2_53beta01;
+typedef version_1_2_53beta02 your_png_h_is_not_version_1_2_53beta02;
diff --git a/projects/wince.txt b/projects/wince.txt
index 07d2c2d4..b78ccb48 100644
--- a/projects/wince.txt
+++ b/projects/wince.txt
@@ -1,6 +1,6 @@
 A set of project files is available for WinCE.  Get
-libpng-1.2.53beta01-project-wince.zip from a libpng distribution
+libpng-1.2.53beta02-project-wince.zip from a libpng distribution
 site such as http://libpng.sourceforge.net/index.html
 
 Put the zip file in this directory (projects) and then run
-"unzip -a libpng-1.2.53beta01-project-wince.zip"
+"unzip -a libpng-1.2.53beta02-project-wince.zip"
diff --git a/projects/xcode/libpng.xcodeproj/project.pbxproj b/projects/xcode/libpng.xcodeproj/project.pbxproj
index f595acdf..9ccf2d75 100644
--- a/projects/xcode/libpng.xcodeproj/project.pbxproj
+++ b/projects/xcode/libpng.xcodeproj/project.pbxproj
@@ -222,7 +222,7 @@
 				COPY_PHASE_STRIP = NO;
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.53beta01;
+				FRAMEWORK_VERSION = 1.2.53beta02;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
@@ -240,7 +240,7 @@
 			buildSettings = {
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.53beta01;
+				FRAMEWORK_VERSION = 1.2.53beta02;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
diff --git a/scripts/README.txt b/scripts/README.txt
index c5e11bb3..138075c2 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,8 +1,8 @@
 
-Makefiles for  libpng version 1.2.53beta01 - January 31, 2015
+Makefiles for  libpng version 1.2.53beta02 - February 5, 2015
 
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.53beta01)
+                       (gcc, creates libpng12.so.0.1.2.53beta02)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@ Makefiles for  libpng version 1.2.53beta01 - January 31, 2015
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.53beta01)
+                       gcc, creates libpng12.so.0.1.2.53beta02)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.gccmmx   =>  Generic gcc makefile previously using MMX code
@@ -38,14 +38,14 @@ Makefiles for  libpng version 1.2.53beta01 - January 31, 2015
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.53beta01)
+                       creates libpng12.so.0.1.2.53beta02)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.53beta01)
+                       creates libpng12.so.0.1.2.53beta02)
  makefile.solaris-x86  =>  Solaris 2.X makefile (gcc, no MMX code,
-                       creates libpng12.so.0.1.2.53beta01)
+                       creates libpng12.so.0.1.2.53beta02)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.53beta01)
+                       creates libpng12.so.0.1.2.53beta02)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 97b60603..785c839c 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.53beta01
+version=1.2.53beta02
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index e2a57137..8b10ac14 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng12
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.53beta01
+Version: 1.2.53beta02
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 30cdd6c3..22bad038 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index ca8ded50..0c1a7990 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index bc83f5c1..4f678bf0 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -23,7 +23,7 @@ LN_SF = ln -f -s
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index f2619a35..44d71f6a 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index d7b9f440..353aabfc 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -77,7 +77,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 59b5c335..f70c3240 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -22,7 +22,7 @@ ZLIBINC=../zlib
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 12
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 58628b4a..8aa98522 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 816cd1b2..221995d2 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -16,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index 71497534..d35f0c0c 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -17,7 +17,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 26347327..8444c297 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index 92cfe378..b45bef58 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index b10ee58d..2c38692e 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 93540c2b..01266243 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 4899a3a9..2f4f3f00 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -81,7 +81,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 7289ad30..980277e1 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng12
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.53beta01
+SHLIB_MINOR=	1.2.53beta02
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index 2ce176e1..5d747eea 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.53beta01
+SHLIB_MINOR=	1.2.53beta02
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index dd76cc61..0fa3f35b 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 733022b0..b4509119 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.53beta01
+SHLIB_MINOR=	1.2.53beta02
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 24660143..aaab410b 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 228162f5..a362f15a 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 468f5a67..6dc3b7b2 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index f8266af0..7ede0f6c 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -11,7 +11,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index e5513865..7181689b 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index c6b7f05f..5c7b02f7 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.53beta01
+PNGMIN = 1.2.53beta02
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/png32ce.def b/scripts/png32ce.def
index aa4da521..b99b9775 100644
--- a/scripts/png32ce.def
+++ b/scripts/png32ce.def
@@ -5,7 +5,7 @@
 LIBRARY lpngce
 
 EXPORTS
-;Version 1.2.53beta01
+;Version 1.2.53beta02
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index 935a1b45..255493f8 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.53beta01
+; Version 1.2.53beta02
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index 31d3abcc..e684fc32 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.53beta01
+;Version 1.2.53beta02
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3