version 2.15
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- speed and quality improvements
version 2.14
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- improved Rust API
- quality improvements for remapping overlays over a background
version 2.13
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- support OpenMP in clang
- dropped old Internet Explorer workarounds
- speed and quality improvements
version 2.12
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- new liq_histogram_add_fixed_color()
- faster for large/complex images
- workarounds for Microsoft's outdated C compiler
version 2.11
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- new liq_image_set_background() for high-quality remapping of GIF frames
- new liq_image_set_importance_map() for controlling which parts of the image get more palette colors
- improved OpenMP support
version 2.10
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- supports building with Rust/Cargo
version 2.9
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- new liq_histogram_add_colors()
version 2.8
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- standalone version
- added Java interface (JNI)
- new API for remapping multiple images to a single shared palette
version 2.7
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- improved dithering of saturated and semitransparent colors
- libimagequant reports detailed progress and supports aborting of operations via callbacks
- fixed order of log output when using openmp
version 2.5
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- 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
version 2.4
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- fixed remapping of bright colors when dithering
- added libimagequant API to add fixed preset colors to the palette
version 2.3
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- 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]
- avoid applying quality setting to images that use palette already
version 2.2
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- 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
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- option to generate posterized output (for use with 16-bit textures)
version 2.0
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- 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
- fixed regression in dithering of alpha channel