Change order of Paperclip image processors - ruby-on-rails

Question

I am using Paperclip to create a thumbnail and apply a watermark to an uploaded image. The problem is that the thumbnail is created from a watermarked image instead of the original.
How can I make a thumbnail from the original file?
Model
has_attached_file :image,processors:[:thumbnail, :watermark], styles:{thumb:"240x240#", original: {watermark_path: "#Rails.root}/public/images/watermark.png"}}
Watermark Processor
module Paperclip
class Watermark < Processor
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
if geometry.present?
#crop = geometry[-1, 1] == '#'
end
#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
# 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
return #file unless watermark_path
dst = Tempfile.new([#basename, #format].compact.join("."))
dst.binmode
command = "convert"
params = [fromfile]
params += transformation_command
params << tofile(dst)
begin
success = Paperclip.run(command, params.flatten.compact.collect { |e| "'#{e}'" }.join(" "))
rescue Paperclip::Errors::CommandNotFoundError
raise Paperclip::Errors::CommandNotFoundError, "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 << tofile(dst)
begin
success = Paperclip.run(command, params.flatten.compact.collect { |e| "'#{e}'" }.join(" "))
rescue Paperclip::Errors::CommandNotFoundError
raise Paperclip::Errors::CommandNotFoundError, "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
if #target_geometry.present?
scale, crop = #current_geometry.transformation_to(#target_geometry, crop?)
trans = %W[-resize #{scale}]
trans += %W[-crop #{crop} +repage] if crop
trans << convert_options if convert_options?
trans
else
scale, crop = #current_geometry.transformation_to(#current_geometry, crop?)
trans = %W[-resize #{scale}]
trans += %W[-crop #{crop} +repage] if crop
trans << convert_options if convert_options?
trans
end
end
end
end