August 24th, 2011· new: support for APNG for both optimization and conversion (animated GIFs)
· new: x64 version
· new: PNG options moved to their own dialog window
· new: option to ignore animated GIFs
· new: option to keep original file date and time
· new: option to force background color (bkGD chunk)
· new: option to keep or force textual information (tEXt chunk)
· new: always on top option for the main window in the contextual menu
· new: suggested screenshot filename now keeps leading "0" for file number (file 001.png, file 002.png...)
· new: suggested screenshot filename now accepts "-" as a number separator (file-01.png file-02.png...)
· change: AvoidGreyWithSimpleTransparency is now disabled by default (was for IE6 compatibility)
· change: keyboard shortcut to clear the list is slightly less complicated: Ctrl+Delete instead of Ctrl+Shift+Delete
· misc: better results with some cases of indexed color images
· misc: updated ZLib 1.2.3 to 1.2.5 (compression library)
· fixed: bad % reported for large files
· fixed: hangs at startup when loading an empty configuration file(PngOptimizer.ini)
· fixed: could not load GIFs containing non-Netscape application extensions blocks (like XMP data from Photoshop CS)
· fixed: could not load GIFs with a compressed block ending with a terminator instead of an end-of-information code
February 20th, 2009· new: uses Windows XP and Windows Vista theme on those platforms
· new: uses a lot less memory when optimizing
· new: when asking for a screenshot file name: does not select the .png part of the file name
· new: when asking for a screenshot file name: proposes a new file name based on the previous file name
· corrected: freezes on Windows Vista
· corrected: better anti-aliased text in the list
May 26th, 2008· optimization engine improved
· new: dump of a clean copy of the source PNG file if the compression cannot be improved
· new: directories accepted for drag-and-drop (with recursive optimization)
· new: TGA files accepted
· new: more BMP formats accepted
· new: added an option to optimize screenshots
· new: added an option to ask for the file name of a screenshot
· new: settings stored in a configuration file instead of the registry