pngslim v1.1 (12-Sep-2021)

• Maintenance release, laying foundations for future development.
• Attempts lossless reduction of 16 to 8 bits per channel images, so some previously rejected files may now be compressed.
• New 'ForceRGBA' mode for greatest compatibility, with potentially worse compression.
• Added file validation and script hardening, for worry-free use.
• Cleaned up script and updated bundled software.

pngslim v1.0 (25-Sep-2009)

• Release of version 1.0, with smarter, more efficient processing!
• Trial 1 to determine the best Color and Pre-filter type has been re-written.
  This adjusts the effort used according to the size of the image. While this
  should give a speed boost, it should not affect compression. Typically
  compression should be equal or slightly improved. Let me know if this is not
  your experience.
• With the re-write, some of the User variable were no longer necessary and
  removed. The script requires less tweaking now and should work great for you
  out of the box.
• Checked UPX compression of apps (v3.03W -ultra-brute -compress-icons=3).
  Compressed 'pngoptimizercl' and 'pngrewrite'.