What's new in pngquant 2.17.0
Nov 22, 2021
- Fix for Unicode filenames on Windows.
- Builds for ARM.
- Small quality improvements.
New in pngquant 2.16.0 (Sep 30, 2021)
- GUI:
- SuperPNG Photoshop plug-in — Mac and Windows. Comparison with "Save for Web"
- PNGoo — Windows GUI for batch conversion
- ImageOptim API — image compression web service that automatically uses pngquant.
- Command-line:
- Binary for Windows
- Latest source code (to build on other platforms)
New in pngquant 2.15.0 (May 8, 2021)
- Speed and quality improvements
New in pngquant 2.13.1 (Nov 22, 2020)
- Small speed and quality improvements
New in pngquant 2.13.0 (Oct 21, 2020)
- Small speed and quality improvements
New in pngquant 2.12.2 (Oct 29, 2018)
- Improved speed on large images
New in pngquant 2.12.0 (Jun 4, 2018)
- Improved speed on large images
New in pngquant 2.11.7 (Jan 19, 2018)
- fixed wildcard support on Windows
- fixed argument parsing on Windows
New in pngquant 2.10.0 (Jul 4, 2017)
- supports building with Rust/Cargo
- supports dynamic linking with system-wide libimagequant
New in pngquant 2.9 (Jul 4, 2017)
- added support for `-o -`
- windows/JNI build fixes
New in pngquant 2.8 (Jul 4, 2017)
- libimagequant is a separate project
- strip option to disable copying of PNG metadata
New in pngquant 2.7 (Nov 4, 2016)
- Improved dithering of saturated and semitransparent colors
- Fixed order of log output when using openmp
- Improved quality sanity check in --skip-if-larger option
- Disabled palette post-processing on colors from --map option to preserve them exactly
New in pngquant 2.6 (Nov 4, 2016)
- When source image has no color profile information, the output won't have either
New in pngquant 2.5.2 (Mar 4, 2016)
- replaced color search algorithm with vantage point tree, which is much faster and more reliable
- deprecated IE6 workaround
- warn when compiled without color profile support
- improved support for predefined colors in libimagequant
- Rust API for libimagequant
New in pngquant 2.4 (Apr 14, 2015)
- fixed remapping of bright colors when dithering
- added libimagequant API to add fixed preset colors to the palette
New in pngquant 2.3.1 (Apr 10, 2015)
- 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
- atomic file saves and fixed --skip-if-larger
- avoid applying quality setting to images that use palette already
- preserving standard PNG chunks (requires libpng 1.6)
- deprecated libpng 1.2 support
New in pngquant 2.2.0 (Jul 25, 2014)
- added ./configure script for better support of Intel C compiler and dependencies
- tweaked quality metric to better estimate quality of images with large solid backgrounds
New in pngquant 2.1 (Jul 25, 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 (Jul 25, 2014)
- 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 (Jul 25, 2014)
- 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)
New in pngquant 1.6 (Jun 14, 2012)
- Novel dithering algorithm that doesn't add noise unless necessary
- Perceptual weighting of colors taking into account edges and noise
- Much faster remapping
- Improved portability, makefiles and man page
New in pngquant 1.5 (Jun 14, 2012)
- Palettes postprocessed with Voronoi iteration
- Better RGBA color similarity algorithm and Floyd-Steinberg remapping
- SSE optimisations
New in pngquant 1.4 (Jun 14, 2012)
- Median cut is applied many times in a feedback loop
- Speed/quality trade-off option
- Faster remap of transparent areas
New in pngquant 1.3 (Jun 14, 2012)
- Significant changes to the algorithm: use of variance to find largest dimensioin and to split most varying boxes
- Use of premultiplied alpha for color blending
- Conversion of output to gamma 2.2
New in pngquant 1.2 (Jun 14, 2012)
- Color computation done in floating point
- Gamma correction applied
- Dropped support for very old systems & compilers
New in pngquant 1.1 (Jun 14, 2012)
- Alpha-sensitive color reduction and dithering
- Support -- and - arguments in command line
- Number of colors optional (defaults to 256)
- Increased maximum number of colors in histogram
New in pngquant 1.0 (Jun 14, 2012)
- Cleaned up Makefile.unx (better gcc optimizations, "clean" target)
- Recompiled binaries with zlib 1.1.4
New in pngquant 0.95 (Jun 14, 2012)
- Fixed Win32 filter bug (binary mode for stdin/stdout)
- Fixed cosmetic "choosing colors" verbosity buglet
- Fixed palette-size bug when number of colors in image < number requested
- Fixed sample-depth bug (png_set_packing() not retroactively smart)
New in pngquant 0.91 (Jun 14, 2012)
- Fixed some verbose/non-verbose oopers
- Fixed Win32 (MSVC) portability issues (getpid(), random(), srandom())
- Added Makefile.w32 for MSVC (tested with 5.0)
New in pngquant 0.90 (Jun 14, 2012)
- Added support for multiple files on command line
- Changed stdin support to write PNG stream to stdout (not "stdin-fs8.png")
New in pngquant 0.75 (Jun 14, 2012)
- Added support for any type of input file [Glenn Randers-Pehrson]
- Fixed palette-(re)scaling bug
- Added -verbose and -quiet options (default now is -quiet)
- Added palette-remapping to minimize size of tRNS chunk
- Made Floyd-Steinberg dithering default
- Changed output naming scheme to -fs8.png and -or8.png (FS or ordered dither)