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dither

0.2.2
0.2.4 0.2.3 0.2.2 0.2.1 0.2.0 0.1.1 0.1.0

A rustler NIF for basic image processing and dithering

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CHANGELOG.md 

# Changelog



All notable changes to this project will be documented in this file.



The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),

and this project adheres to

[Semantic Versioning](https://semver.org/spec/v2.0.0.html).



## [0.2.2] - 2026-04-13



Better support for RGBA images and new rotation utility.



### Added



- Support for loading and decoding RGBA images (4 channels).

- `Dither.to_rgb/1` and `Dither.to_rgb!/1` to convert images to RGB8.

- `Dither.rotate/2` and `Dither.rotate!/2` to rotate images (90, 180, 270 degrees).

- Explicit channel count check in `Dither.dither/2`.



### Changed



- `Dither.dither/2` now returns `{:error, :unsupported_channel_count}` if an

  RGBA image is provided without conversion.



## [0.2.1] - 2026-04-13



Adds color dithering support and custom color palettes



- Implemented dithering support for RGB images using custom palettes

- Added Dither.Palette module for normalizing colors and providing predefined

  palettes

- Defined several built-in palettes: `:cga`, `:websafe`, and `:crayon`



## [0.2.0] - 2026-04-13



Adds a new %Dither{} struct (replaces the reference returned from `load/1`,

`decode/1`, and `from_raw/3`). Adds metadata to the struct (including image size

and channels). Improves documentation, and adds testing



## [0.1.1] - 2025-12-07



Bug fixes.



### Changed



`Dither.from_raw` previously only accepted a list as the first argument, whereas

it should only allow a binary. This has been fixed.



Proper usage:



```elixir

iex> Dither.from_raw(<<1>>, 1, 1)

{:ok, #Reference<0.253499029.2847801345.146246>}

```



[unreleased]: https://github.com/protolux-electronics/dither/compare/v0.2.2...HEAD

[0.2.2]: https://github.com/protolux-electronics/dither/compare/v0.2.1...v0.2.2

[0.2.1]: https://github.com/protolux-electronics/dither/compare/v0.2.0...v0.2.1

[0.2.0]: https://github.com/protolux-electronics/dither/compare/v0.1.1...v0.2.0

[0.1.1]: https://github.com/protolux-electronics/dither/compare/v0.1.0...v0.1.1

[0.1.0]: https://github.com/protolux-electronics/dither/releases/tag/v0.1.0