BlurHash

Pure Elixir implementation of Blurhash algorithm with no additional dependencies.

Blurhash is an algorithm by Dag Ågren of Wolt that decodes an image to a very compact (~ 20-30 bytes) ASCII string representation, which can be then decoded into a blurred placeholder image. See the main repository for the rationale and details.

This library supports only encoding.

More details on https://blurha.sh/

Documentation available on hexdocs: https://hexdocs.pm/blurhash

Installation

BlurHash is published on Hex. Add it to your list of dependencies in mix.exs:

def deps do
  [
    {:blurhash, "~> 1.0.0"}
  ]
end

Usage

# Pixel data supplied in RGB order, with 3 bytes per pixels.
pixels = [255, 43, 20, 11, 0, 155, ...]

hash = BlurHash.encode(pixels, 30, 30, 4, 3)

IO.inspect(hash) # "LEHV6nWB2yk8pyo0adR*.7kCMdnj"

If you would like to convert raw binary instead of RGB image format, you can use eg Mogrify package to perform conversion.

import Mogrify

file =
  open(path)
  |> format("rgb")
  |> save()

pixels =
  File.read!(file.path)
  |> :binary.bin_to_list()

hash = BlurHash.encode(pixels, 30, 30, 4, 3)

IO.inspect(hash) # "LEHV6nWB2yk8pyo0adR*.7kCMdnj"

Contributing

Any contributions you make are greatly appreciated 🤓.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

License

Distributed under the MIT License. See LICENSE.md for more information.

Contact

@perzanko

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Project Link: https://github.com/perzanko/blurhash-elixir