Paperclip Watermark processor

watermark.rb

class User
  has_attached_file :photo,
                    :processors => [:watermark],
                    :styles => {
                      :medium => {
                        :geometry       => "300x300>",
                        :watermark_path => "#{Rails.root}/public/images/watermark.png"
                      },
                      :thumb => "100x100>",
                    }
end

# Rails.root /lib/paperclip_processors/watermark.rb
module Paperclip
  class Watermark < Thumbnail
    def initialize(file, options = {}, attachment = nil)
      super
      @watermark_path = options[:watermark_path]
      @position       = options[:position].nil? ? "SouthEast" : options[:position]
    end

    def make
      src = @file
      dst = Tempfile.new([@basename].compact.join("."))
      dst.binmode

      return super unless @watermark_path

      params = "-gravity #{@position} #{transformation_command.join(" ")} #{@watermark_path} :source :dest"

      begin
        success = Paperclip.run("composite", params, :source => "#{File.expand_path(src.path)}[0]", :dest => File.expand_path(dst.path))
      rescue PaperclipCommandLineError
        raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny
      end

      dst
    end
  end
end

Thanks It worked for me, after loading the file manually on the model:

class Photo < ActiveRecord::Base
require 'paperclip_processors/watermark'
....

Thanks so much!

I keep getting an error:

NameError (uninitialized constant Paperclip::Watermark::PaperclipCommandLineError):
lib/paperclip/watermark.rb:66:in rescue in make' lib/paperclip/watermark.rb:64:inmake'
app/controllers/assets_controller.rb:10:in `create'

It seems like some of your library is missing. Allow me couple of minutes before we engage on the meeting.

…

On 8/2/12 2:34 AM, "Kevin Collignon" ***@***.*** .com> wrote: I keep getting an error: NameError (uninitialized constant Paperclip::Watermark::PaperclipCommandLineError): lib/paperclip/watermark.rb:66:in `rescue in make' lib/paperclip/watermark.rb:64:in`make' app/controllers/assets_controller.rb:10:in `create' --- Reply to this email directly or view it on GitHub: https://gist.github.com/784445

Hi, I have made some revision for Rails 4 and Paperclip 4.1.1
https://gist.github.com/ardianys/2ca22ebd47431b92dd3e/revisions
Thanks for your gist

Thanks. I needed change some things, look at transformation_command_fix:

def make
  src = @file
  dst = Tempfile.new([@basename].compact.join("."))
  dst.binmode
  return super unless @watermark_path
  transformation_command_fix=transformation_command.join(" ").sub("-auto-orient ", '')
  params = "-gravity #{@position} #{transformation_command_fix} #{@watermark_path} :source :dest"
  Paperclip.run("composite", params, :source => "#{File.expand_path(src.path)}[0]", :dest => File.expand_path(dst.path))
  dst
end

Hey, I want to add watermark diagonally can anybody help me what I need to do?

Thanks in advanse.