version 1.2.28 [April 30, 2008] Fixed bug (introduced in libpng-1.0.6) with handling zero-length unknown chunks. Added more information about png_set_keep_unknown_chunks() to the documetation. Revised documentation about unknown chunk and user chunk handling. Issue a png_warning when reading a tRNS chunk with out-of-range samples. Added check for NULL ptr in TURBOC version of png_free_default(). Removed several unnecessary checks for NULL before calling png_free(). Revised png_set_tRNS() so that calling it twice removes and invalidates the previous call. Revised pngtest to check for out-of-range tRNS samples. Added AC_LIBTOOL_WIN32_DLL to configure.ac Added MAINTEINERCLEANFILES variable to Makefile.am Avoid changing color_type from GRAY to RGB by png_set_expand_gray_1_2_4_to_8(). Fix broken URL for rfc2083 in png.5 and libpng-*.txt Removed a stray object file from contrib/gregbook Reproducible: Always Steps to Reproduce:
no difference between 1.2.27 and 1.2.28
*** Bug 228053 has been marked as a duplicate of this bug. ***
