Shikimo (CarrierWave::Daltonize)

Shikimo (色盲) means colour-blind in Japanese.

Adds daltonize processing to ruby and carrierwave (using ruby-vips).

For more information on how the algorithm works, check out this blog post

Click to see processing samples

Installation

Requires ruby-vips. See https://github.com/jcupitt/ruby-vips

Add this line to your application's Gemfile:

gem 'carrierwave-daltonize'

And then execute:

$ bundle

Or install it yourself as:

$ gem install carrierwave-daltonize

Usage

In your carrierwave uploader, include carrierwave daltonize, and then use any of the daltonize processing functions.

class ColourBlindUploader < CarrierWave::Uploader::Base
  include CarrierWave::Daltonize

  version :deuteranope
    process :daltonize => :deuteranope
  end

  version :protanope
    process :daltonize => :protanope
  end

  version :tritanope
    process :daltonize => :tritanope
  end
end

Standalone

You can also use the ruby code without carrierwave to process an image file.

Usage:

./lib/daltonize.rb in.jpg out.jpg deuteranope

In your ruby code:

require 'rubygems'
require 'vips'
require 'carrierwave-daltonize'

# to process an image filename for deuteranopia and save it
Daltonize.daltonize_file(source, destination, :deuteranope)

# or calling the daltonize function directly

im = VIPS::Image.new(source)
im = Daltonize.tritanope(im)
im.write(destination)

There's also a version of the algorithm in nip2 for easy testing of the details of the parameters. See 'other' directory. Run with something like:

nip2 daltonize.ws

This workspace needs version 7.33 or later of nip2.

CarrierWave::VIPS

Note that CarrierWave::Daltonize no longer relies on CarrierWave::VIPS. You can use it with any other CarrierWave plugin.

However, since you already need ruby-vips to run this, it would make sense to use it too.

CarrierWave::VIPS should dramatically increase the speed and reduce memory footprint of your carrierwave image processing.

Contributors

• John Cupitt (@jcupitt) - created the ruby-vips algorithm and greatly improved the python/javascript implementations
• Oliver Siemoneit - created the original python code for MoinMoin
• Yoav Aner (@gingerlime) - adapted the code and wrapped it into this Gem

Contributing

1. Fork it
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 new Pull Request

License

The MIT License (MIT)

Copyright (c) 2013 John Cupitt, Yoav Aner, kenHub GmbH

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.