Release Notes: The image recompression core was rewritten. Full support for pictures with transparency was added. Palette and alpha channel optimization routines were added. Support for color to grayscale conversion was added for better compression.
Release Notes: This release adds a parameter to allow alpha channel removal based on average image transparency.
Release Notes: This release fixes compilation issues with libpng 1.5.x.
Release Notes: This release added SASL support for HTTP authentication and fixed nameserver-related code that prevented compilation on certain OS and architecture combinations, such as glibc and GCC on ARM.
Release Notes: Non-POSIX behavior which brought problems with eglibc was fixed. A Safari HTTP authentication problem was fixed.
Release Notes: Code to avoid unnecessary image processing was added, providing some CPU processing savings. The stdin/stdout daemon-mode kludges were fixed.