What's new in pngquant 2.17.0
Oct 13, 2022
- Fixed Unicode filenames on Windows
- Builds for ARM
- Small quality improvements
New in pngquant 2.16.0 (Oct 13, 2022)
- Reduced stack usage, prevenitng stack overlfow in pathological cases
New in pngquant 2.15.0 (Oct 13, 2022)
- Speed and quality improvements
New in pngquant 2.12.0 (Oct 13, 2022)
- Improved speed on large images
- OpenMP fixes/workarounds
New in pngquant 2.10.0 (Jul 4, 2017)
- supports building with Rust/Cargo
- supports dynamic linking with system-wide libimagequant
New in pngquant 2.4.0 (Apr 14, 2015)
- fixed remapping of bright colors when dithering
- added libimagequant API to add fixed preset colors to the palette
New in pngquant 2.3.4 (Feb 2, 2015)
- Fixed compatibility with libpng 1.4/1.5
New in pngquant 2.3.1 (Oct 16, 2014)
- Added ./configure script for better support of Intel C compiler and dependencies [thanks to pdknsk]
- Tweaked quality metric to better estimate quality of images with large solid backgrounds [thanks to Rolf Timmermans]
- Atomic file saves and fixed --skip-if-larger
- Avoid applying quality setting to images that use palette already
New in pngquant 2.2.0 (Apr 15, 2014)
- preserving of unknown PNG chunks (enables optimized Android 9-patch images)
- improved color profile support: cHRM & gAMA as alternative to ICC profiles, OpenMP acceleration
- improved support for Intel C Compiler, speedup in 32-bit GCC, and some workarounds for Visual Studio's incomplete C support
New in pngquant 2.1.0 (Feb 27, 2014)
- option to save files only if they're compressed better than the original
- option to generate posterized output (for use with 16-bit textures)
- support for ICC profiles via Little CMS library
New in pngquant 2.0.0 (Aug 27, 2013)
- refactored codebase into pngquant and standalone libimagequant
- reduced memory usage by further 30% (and more for very large images)
- less precise remapping improving speed by 25% in higher speed settings
- --output option for writing converted file under the given path
- light dithering with --floyd=0.5
- fixed regression in dithering of alpha channel
New in pngquant 1.8 (Aug 27, 2013)
- min/max quality option (number of colors is automatically adjusted for desired quality level)
- switched option parsing to getopt_long (syntax such as -s1 and --ext=ext is supported)
- significantly improved performance thanks to custom partial sorting
- optional Cocoa (Mac OS X) image reader for color profile support
- reduced memory usage by 20%
- remapping improved for very low number of colors
New in pngquant 1.7 (Jun 14, 2012)
- new, accurate RGBA color similarity algorithm
- change of optional SSE3 code to SSE2 that is always enabled on x86-64
- optional OpenMP-based parallelisation of remapping
- significantly improved performance thanks to custom partial sorting
- changed long options to use double hyphen (-force to --force) [thanks to Jari Aalto]