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    <p>I did not test this, but you should be able to use the "convert_options" parameter, like this:</p> <pre><code>:convert_options =&gt; { :all =&gt; ‘-colorspace Gray’ } </code></pre> <p>Have a look at <a href="https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/thumbnail.rb" rel="noreferrer">https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/thumbnail.rb</a></p> <p>I personnaly use my own processor.</p> <p>In Model:</p> <pre><code> has_attached_file :logo, :url =&gt; PaperclipAssetsController.config_url, :path =&gt; PaperclipAssetsController.config_path, :styles =&gt; { :grayscale =&gt; { :processors =&gt; [:grayscale] } } </code></pre> <p>In lib:</p> <pre><code>module Paperclip # Handles grayscale conversion of images that are uploaded. class Grayscale &lt; Processor def initialize file, options = {}, attachment = nil super @format = File.extname(@file.path) @basename = File.basename(@file.path, @format) end def make src = @file dst = Tempfile.new([@basename, @format]) dst.binmode begin parameters = [] parameters &lt;&lt; ":source" parameters &lt;&lt; "-colorspace Gray" parameters &lt;&lt; ":dest" parameters = parameters.flatten.compact.join(" ").strip.squeeze(" ") success = Paperclip.run("convert", parameters, :source =&gt; "#{File.expand_path(src.path)}[0]", :dest =&gt; File.expand_path(dst.path)) rescue PaperclipCommandLineError =&gt; e raise PaperclipError, "There was an error during the grayscale conversion for #{@basename}" if @whiny end dst end end end </code></pre> <p>This might not be 100% necessary for a simple grayscale conversion, but it works!</p>
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    1. COSorry for the delay, thanks for the great answer!
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    2. COWell feels like it is wayyy easier to add in in the convert options `:styles => { :grey => "450x250" }, :convert_options => {:grey => "-blur 0x8"}`
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