stumpy_jpeg

WORK IN PROGRESS

Read sequential and progressive JPEGs.

• Does not support arithmetic encoding.

Installation

1. Add the dependency to your shard.yml:

dependencies:
  stumpy_jpeg:
    github: reiswindy/stumpy_jpeg

2. Run shards install

Interface

• StumpyJPEG.read(file : String) : Canvas reads a JPEG image from a file
• StumpyJPEG.read(io : IO) : Canvas reads a JPEG image from an IO
• StumpyJPEG::JPEG holds image associated data during parsing

Usage

require "stumpy_jpeg"

canvas = StumpyJPEG.read("yamboli.jpg")

For progressive reading

require "stumpy_jpeg"

StumpyJPEG.read("yamboli.jpg") do |canvas|
  r, g, b = canvas[0, 0].to_rgb8
  puts "red=#{r}, green=#{g}, blue=#{b}"
end

To Do / Wishlist

• [ ] JFIF header parsing support
• [x] Downsampled image support
• [ ] Arithmetic encoding support
• [ ] Add more tests

Contributing

1. Fork it (https://github.com/reiswindy/stumpy_jpeg/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• reiswindy - creator and maintainer