How can I reduce the quality of an uploading image using Paperclip?

Question

I am running Ruby on Rails 3 and I would like to reduce the quality of an uploading image using the Paperclip plugin/gem. How can I do that?

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A

Answer 1

As James says, once you figure out the correct arguments to pass to ImageMagick's convert by experimenting on the command line, you can pass these in to Paperclip through the convert_options option as in James' example.

If you have multiple arguments, pass them in as an array. Here's an example which I laboured over for a while:

:convert_options => {:medium => ["-shave", "2x2", "-background", "white", 
                                 "-gravity", "center", "-extent", 
                                 "530x322", "+repage"],
                     :small  => ["-shave", "1x1"] }