Rails Paperclip image compression compared to what Page Speed produces - ruby-on-rails

Question

I've set up paperclip in rails and everything is working hunky-dory (i actually had to google that...:).
I've noticed however that Page Speed tells me I could losslessly compress my thumbnail and large images (the ones that paperclip produces) further. Is there an option I can put into my model which does this? I've noticed that mod_deflate doesn't compress images (I'm using Firefox).

Answer 1

You can add compression to paperclip processing using the paperclip-compression gem.
In your Gemfile:
gem "paperclip-compression", "~> 0.1.1"
(of course run bundle install)
In your model:
has_attached_file :avatar,
:styles => { :medium => "300x300>", :thumb => "100x100>" },
:processors => [:thumbnail, :compression]
"jpegtran works by rearranging the compressed data (DCT coefficients), without ever fully decoding the image. Therefore, its transformations are lossless"
Note: if you are running on heroku, you'll need jpegtran, and optipng binaries added to your application. Here's a good article on running binaries on heroku.

Answer 2

You should do your own testing on various JPEG compression levels but I've noticed that I can bump ImageMagicks quality setting down to 75 and still not see any noticeable difference - with about a 30-40% file size savings.
My model looks like:
has_attached_file :photo,
:styles => {
:"185x138" => {
:geometry => "185x138>"
} },
:convert_options => {
:all => "-auto-orient",
:"185x138" => "-quality 75",
-quality 75 is for ImageMagick. If you're using a different processor you will need to adjust accordingly.

Answer 3

What about FFMPEG or AVCONV?
sudo apt-get install ffmpeg/avconv
= initializer
Paperclip.options[:command_path] = "/usr/bin/" # see `which ffmpeg`
= Modal
after_save :compress_with_ffmpeg
def compress_with_ffmpeg
[:thumb, :original, :medium].each do |type|
img_path = self.avtar.path(type)
Paperclip.run("ffmpeg", " -i #{img_path} #{img_path}")
end
end