March 20th, 2012· Fixed a regression in the reduction of palette-encoded grayscale images. This regression was introduced in version 0.7.
January 25th, 2011· Upgraded libpng to version 1.4.5-optipng [private]
· Upgraded zlib to version 1.2.5-optipng [private]
· Fixed the I/O states (in libpng 1.4.5); they caused incorrect file reads in some rare cases.
· Fixed processing of PNG files with chunks of size 0.
· Fixed a display error in the TIFF import.
· Improved checking of the arguments of -f, -zc, -zm and -zs.
· Removed quirks from the rangeset option argument syntax.
· Fixed a build issue under the system-supplied libpng-1.4.
· Resolved forward-compatibility issues regarding libpng-1.5; however, the system-supplied libpng-1.5 is not yet supported.
· Added various enhancements to the configure+make build system.
October 22nd, 2010· Upgraded libpng to version 1.4.1-optipng [private]
· Upgraded zlib to version 1.2.4-optipng [private]
· Added the option -nx.
· Clarified the behavior of -nz and the relation between -nz and -o0.
· Added a filesystem check (resolving normalized paths, symlinks, etc.) to better detect when the output overwrites the input.
· Enabled automatic wildcard expansion (i.e. globbing) on Win64.
· Fixed a Unicode build issue on Windows.
October 22nd, 2010· Upgraded libpng to version 1.2.36-optipng [private]
· Fixed a use-after-free error in the GIF reader.
· Flushed the output log to display the current trial in real time.
· This only worked on Windows in the previous version.
· Fixed an error in reporting unrecognized file formats.
· Removed the requirement to "fix" TIFF files that contain unrecognized metadata.
· Simplified the option abbreviation rules. Option names can now be abbreviated to their shortest unique prefix, as in X11 application.
October 22nd, 2010· Upgraded libpng to version 1.2.33-optipng [private]
· Put back a speed optimization, accidentally removed in version 0.6, allowing singleton trials (-o1) to be bypassed in certain conditions.
· Fixed an array overflow in the BMP reader.
· Fixed the loss of private chunks under the -snip option.
· Produced a more concise on-screen output in the non-verbose mode.)
· Added a programming interface to the optimization engine, in order to facilitate the development of PNG-optimizing GUI apps and plugins.
October 22nd, 2010· Upgraded cexcept to version 2.0.1.
· Added a configure script, to be used instead of unix-secure.mak.
· Fixed a build issue that occured when using libpng from the system.
· Fixed processing when image reduction yields an output larger than the original.
· Fixed behavior of -preserve.
· Removed displaying of partial progress when abandoning IDATs under the -v option. The percentages displayed were not very accurate.
October 22nd, 2010· Upgraded libpng to version 1.2.29-optipng [private]
· Implemented grayscale(alpha)-to-palette reductions.
· Improved conversion of bKGD info during RGB-to-palette reductions.
· Fixed conversion of bKGD and tRNS during 16-to-8-bit reductions.
· Added support for compressed BMP (incl. PNG-compressed BMP, you bet!)
· Improved the speed of reading raw PNM files.
· Recognized PNG digital signatures (dSIG) and disabled optimization in their presence, to preserve their integrity.
· Allowed the user to enforce the optimization of dSIG'ed files.
· Recognized APNG animation files and disabled reductions to preserve their integrity.
· Added the -snip option, to allow the user to "snip" one image out of a multi-image file, such as animated GIF, multi-page TIFF, or APNG.
· Improved recovery of PNG files with incomplete IDAT.
· Fixed a crash triggered by the use of -log on some platforms.
· Fixed behavior of -out and -dir when the input is already optimized.
· Provided more detailed image information at the start of processing.
· Provided a more detailed summary at the end of processing, under the presence of the -v option and/or the occurence of exceptional events.
August 24th, 2007· Upgraded libpng to version 1.2.15-optipng [private]
· Used a previously-missed RGB-to-palette reduction opportunity for images containing 256 distinct colors. (Thanks to Joachim Kluge for the report.)
· Fixed conversion of bKGD info during rgb-to-palette reductions. (Thanks to Matthew Fearnley for the report.)
· Fixed pre-computation of iterations. (Thanks to Matthew Fearnley for the report.)
· Eliminated a false alarm when processing RGB images with tRNS in Unix-secure mode. (Thanks to Till Mass for the report, and thanks to Nelson A. de Oliveira for the fix.)
· Fixed behavior of -out and -dir when changing interlacing. (Thanks to Martin Packman for the report.)
· Fixed behavior of "-dir [DRIVE]:" on Windows.
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