Lossless compression of images in Rails using Dragonfly & image_optim

README.md

This runs provides an .optim job for dragonfly and also adds the .optim job into .thumb

This requires you have the 'image_optim' gem and it's dependencies.

dragonfly.rb

require 'dragonfly/image_optim_processor'
app = Dragonfly[:images]
app.configure do |c|
  c.processor.register(ImageOptimProcessor)
  c.job :optim do
    process :optim
  end
  c.job :thumb do |geometry, format|
    process :thumb, geometry
    process :optim
    encode format if format
  end
end

image_optim_processor.rb

class ImageOptimProcessor
  def optim(temp_object)
    io = ImageOptim.new
    optimized = io.optimize_image(temp_object.path)
    optimized.nil? ? temp_object : optimized
  end
end

Very helpful gist! I'm wondering why you have optim before encode?
I would assume that optim would be the last thing to be done.

I had to tweak it a bit for last version of ImageOptim and Dragonfly, see : https://gist.github.com/bobbus/8913693