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    <p>I added the following to <code>RAILS_ROOT/lib/paperclip_processors/watermark.rb</code>:</p> <pre><code>module Paperclip class Watermark &lt; Processor # Handles watermarking of images that are uploaded. attr_accessor :current_geometry, :target_geometry, :format, :whiny, :convert_options, :watermark_path, :overlay, :position def initialize file, options = {}, attachment = nil super geometry = options[:geometry] @file = file @crop = geometry[-1,1] == '#' @target_geometry = Geometry.parse geometry @current_geometry = Geometry.from_file @file @convert_options = options[:convert_options] @whiny = options[:whiny].nil? ? true : options[:whiny] @format = options[:format] @watermark_path = options[:watermark_path] @position = options[:position].nil? ? "SouthEast" : options[:position] @overlay = options[:overlay].nil? ? true : false @current_format = File.extname(@file.path) @basename = File.basename(@file.path, @current_format) end # TODO: extend watermark # Returns true if the +target_geometry+ is meant to crop. def crop? @crop end # Returns true if the image is meant to make use of additional convert options. def convert_options? not @convert_options.blank? end # Performs the conversion of the +file+ into a watermark. Returns the Tempfile # that contains the new image. def make dst = Tempfile.new([@basename, @format].compact.join(".")) dst.binmode command = "convert" params = [fromfile] params += transformation_command params &lt;&lt; tofile(dst) begin success = Paperclip.run(command, params.flatten.compact.collect{|e| "'#{e}'"}.join(" ")) rescue PaperclipCommandLineError raise PaperclipError, "There was an error resizing and cropping #{@basename}" if @whiny end if watermark_path command = "composite" params = %W[-gravity #{@position} #{watermark_path} #{tofile(dst)}] params &lt;&lt; tofile(dst) begin success = Paperclip.run(command, params.flatten.compact.collect{|e| "'#{e}'"}.join(" ")) rescue PaperclipCommandLineError raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny end end dst end def fromfile File.expand_path(@file.path) end def tofile(destination) File.expand_path(destination.path) end def transformation_command scale, crop = @current_geometry.transformation_to(@target_geometry, crop?) trans = %W[-resize #{scale}] trans += %W[-crop #{crop} +repage] if crop trans &lt;&lt; convert_options if convert_options? trans end end end </code></pre> <p><strong>Update:</strong> If you're using a new version of paperclip (3+), the begin block should now look like this:</p> <pre><code>begin Paperclip.run(command, params.join(' ')) rescue Cocaine::ExitStatusError =&gt; e raise Paperclip::Error, "There was an error processing the watermark for #{@basename}" if @whiny rescue Cocaine::CommandNotFoundError =&gt; e raise Paperclip::Errors::CommandNotFoundError.new("Could not run the `convert` command. Please install ImageMagick.") end </code></pre> <p>And then the <code>image_decorator.rb</code> model:</p> <pre><code>require 'paperclip_processors/watermark' Spree::Image.class_eval do has_attached_file :attachment, :processors =&gt; [:thumbnail, :watermark], :styles =&gt; { :mini =&gt; '48x48&gt;', :small =&gt; '100x100&gt;', :product =&gt; '160x160#', :large =&gt; { :geometry =&gt; '460x680&gt;', :watermark_path =&gt; "#{Rails.root}/public/spree/watermark.png", :position =&gt; 'SouthWest', :format =&gt; :png } }, :default_style =&gt; :product, :url =&gt; '/spree/products/:id/:style/:basename.:extension', :path =&gt; ':rails_root/public/spree/products/:id/:style/:basename.:extension' end </code></pre>
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    1. POHow to watermark images using Imagemagick?
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    1. COIs... this an answer or part of the question?
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    2. COThis is the answer, but i cant mark it as the answer yet...
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