colorant

Colorant is a small utility to determine which colors are present in a particular image, and how much they appear. It wraps ImageMagick's convert command, so it has to be installed on the system.

Just put it in your Gemfile:

gem "colorant"

And wherever you want, you only need a filename, and you get an array of color percentual frequencies of your image.

Colorant.process "path/to/my/leaves.jpg"
# => [["Brown", 78.95], ["Green", 3.85], ...]

These are other options you can specify:

Colorant.process "file", :colors => 5,      # Default is 8
                         :depth => 24,      # Default is 16
                         :extended => true  # Use more accurate color names

# => [["Vanilla Brown", 78.95], ["Lime Green", 3.85], ...] (up to 5 colors)

You can also use colorant from the command line. It is simple:

gem install colorant
colorant path/to/my/photo.jpg --colors 9 --extended

And the output:

  Cocoa Brown		-- 40.54 %
  Moccaccino Red		-- 17.88 %
  Rock Brown		-- 12.76 %
  ... 

The options you can use are the same as the above explained, just with the CLI-like format.

• Fork the project.
• Make your feature addition or bug fix.
• Add specs for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. If you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull.
• Send me a pull request. Bonus points for topic branches.

Copyright (c) 2010 Codegram. See LICENSE for details.