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CHANGELOG
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CHANGELOG
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version 3.0
-----------
- replaced C libimagequant library with a Rust imagequant crate
- switched build system from make to Cargo
version 2.17
------------
- fixed Unicode filenames on Windows
- builds for ARM
- small quality improvements
version 2.16
------------
- reduced stack usage, prevenitng stack overlfow in pathological cases
version 2.13-2.15
------------
- speed and quality improvements
version 2.12
------------
- improved speed on large images
- OpenMP fixes/workarounds
version 2.11
------------
- fixed wildcard support on Windows
- fixed argument parsing on Windows
version 2.10
------------
- supports building with Rust/Cargo
- supports dynamic linking with system-wide libimagequant
version 2.9
-----------
- added support for `-o -`
- windows/JNI build fixes
version 2.8
-----------
- libimagequant is a separate project
- --strip option to disable copying of PNG metadata
version 2.7
-----------
- 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
version 2.6
-----------
- when source image has no color profile information, the output won't have either
version 2.5
-----------
- 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
- Rust API for libimagequant
version 2.4
-----------
- fixed remapping of bright colors when dithering
version 2.3
-----------
- 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
- preserving standard PNG chunks (requires libpng 1.6)
- deprecated libpng 1.2 support
version 2.2
-----------
- 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
version 2.1
-----------
- 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
version 2.0
-----------
- 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
version 1.8
-----------
- 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
version 1.7
-----------
- 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
- changed long options to use double hyphen (-force to --force) [thanks to Jari Aalto]
version 1.6
-----------
- 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
version 1.5
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- palettes postprocessed with Voronoi iteration
- better RGBA color similarity algorithm and Floyd-Steinberg remapping
- SSE optimisations
version 1.4
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- median cut is applied many times in a feedback loop
- speed/quality trade-off option
- faster remap of transparent areas
version 1.3
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- 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
version 1.2
-----------
- color computation done in floating point
- gamma correction applied
- dropped support for very old systems & compilers
version 1.1
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- 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
version 1.0
-----------
- cleaned up Makefile.unx (better gcc optimizations, "clean" target)
- recompiled binaries with zlib 1.1.4
version 0.95
------------
- 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)
version 0.91
------------
- fixed some verbose/non-verbose oopers
- fixed Win32 (MSVC) portability issues (getpid(), random(), srandom())
- added Makefile.w32 for MSVC (tested with 5.0)
version 0.90
------------
- added support for multiple files on command line
- changed stdin support to write PNG stream to stdout (not "stdin-fs8.png")
version 0.75
------------
- 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)
version 0.70
------------
- first public release