favicon_logos_uploader.rb

class FaviconLogosUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  version :favicon do
    process :resize_to_fit => [32, 32]
    process :convert => :ico

    def full_filename(for_file)
      "favicon.ico" if original_filename
    end
  end

  def filename
    "original_favicon#{extension}" if original_filename
  end

  def extension
    File.extname(original_filename) if original_filename
  end

end

gistfile1.rb

CarrierWave::ProcessingError: Failed to manipulate with MiniMagick, maybe it is not an image? Original Error: Command ("identify -quiet -ping "/Users/arthurnn/500px/portfolio/public/uploads/tmp/20130416-1920-24385-2807/favicon_screenshot.png"") failed: {:status_code=>1, :output=>"identify: improper image header `/Users/arthurnn/500px/portfolio/public/uploads/tmp/20130416-1920-24385-2807/favicon_screenshot.png' @ error/png.c/ReadPNGImage/3699.\n"}
  from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/processing/mini_magick.rb:264:in `rescue in manipulate!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/processing/mini_magick.rb:258:in `manipulate!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/processing/mini_magick.rb:107:in `convert'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/processing.rb:85:in `block in process!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/processing.rb:81:in `each'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/processing.rb:81:in `process!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `each'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/cache.rb:122:in `cache!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/versions.rb:236:in `block in cache_versions!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/versions.rb:221:in `each'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/versions.rb:221:in `cache_versions!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `each'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/cache.rb:122:in `cache!'
	from /Users/arthurnn/.rvm/gems/ruby-2.0.0-p0@500px_portfolios/gems/carrierwave-0.8.0/lib/carrierwave/uploader/store.rb:56:in `store!'
	from (irb):28