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Jonathon Marshall

2006-Nov-16 18:36 UTC

file_column and image watermarks

This code works for watermarking images with file_column, however it 
currently watermarks the original and not the other versions (though for 
obvious reasons I dont want it on the small sizes). How can I apply this 
watermark code to other versions of my file_column entries.

Also it should be noted that the watermark_image function is not mine, I 
found it on a message board but have since lost the link. Big thanks to 
whomever wrote it originally.

Thanks for your help.

Here is my entire Avatar model, theres no sense in trying to keep this a 
secret or anything as Im sure there are many people that want or could 
use this code.

class Avatar < ActiveRecord::Base

  #
  # Associations
  #
  belongs_to :profile

  #
  # File Column
  #
  file_column :image,
    :permission => "0664",
    :magick => {
      :versions => {
        :full => { :size => ''400x300>''},
        :square => { :crop => ''1:1'', :size =>
''90x90!'' },
        :icon => { :crop => ''1:1'', :size =>
''60x60!'' }
    }
  }

  #
  # Before, During & After
  #
  before_create :watermark_image

  #
  # Validations
  #
  validates_file_format_of :image,
    :in => [''jpg'', ''png'',
''gif''], :message => ''must be jpg, png or
gif''

  #
  # Private Methods
  #
  private
  def watermark_image
    #require ''RMagick''
    dst = Magick::Image.read(self.image).first
    src = 
Magick::Image.read("#{RAILS_ROOT}/public/images/watermark.png").first

    result = dst.composite(src, Magick::CenterGravity, 
Magick::OverCompositeOp)
    result.write(self.image)
  end

end

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Brian Hogan

2006-Nov-16 18:49 UTC

head link

Re: file_column and image watermarks

That looks like my code. My solution for your problem is simple: Upload the
image twice :)  One gets put in the public folder, another one gets put in a
private folder.

This was originally going to be in a book I was going to write, but I
don''t
have time any more.

def create
  @photo = Photo.new params[:photo]
  @photo.public = params[:photo][:filename]
  if @photo.save
    flash[:notice] = "The photo was saved!"
    redirect_to :action => "list"
  else
    render :action=>"new"
  end
end

What I do here is make the user upload the photo once into a filed called
filename.  Then I use the controller to populate the public field as well.
This way the user doesn''t need to upload the photo twice. I''d
like to be
able to do this in the model but there''s not yet a 100% working
solution for
that yet. I just throw an exception if they didn''t do that :)

Upon creation, the public picture gets the watermark applied.

class Photo < ActiveRecord::Base
    file_column :filename, :store_dir => "photos", :magick => {
      :versions => {"medium" => "640x480>",
"large" => "1024x768" }
    }


    file_column :public, :magick => {
      :versions => { "thumb" => "50x50",
"large" => "320x240>" }
      }

    validates_presence_of :filename, :description
    before_create :watermark_image

    private
    def watermark_image
        raise "Ensure that you have set the public field for the photo in
the controller. Usually you want to set @photo.public
params[''photo''][''filename'']" if
self.public == nil
        require ''RMagick''
        dst = Magick::Image.read(self.public).first
        src =
Magick::Image.read("#{RAILS_ROOT}/config/sample.png").first
        result = dst.composite(src, Magick::CenterGravity,
Magick::OverCompositeOp)
        result.write(self.public)

    end

end



Good luck with that!




On 11/16/06, Jonathon Marshall
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> This code works for watermarking images with file_column, however it
> currently watermarks the original and not the other versions (though for
> obvious reasons I dont want it on the small sizes). How can I apply this
> watermark code to other versions of my file_column entries.
>
> Also it should be noted that the watermark_image function is not mine, I
> found it on a message board but have since lost the link. Big thanks to
> whomever wrote it originally.
>
> Thanks for your help.
>
> Here is my entire Avatar model, theres no sense in trying to keep this a
> secret or anything as Im sure there are many people that want or could
> use this code.
>
> class Avatar < ActiveRecord::Base
>
>   #
>   # Associations
>   #
>   belongs_to :profile
>
>   #
>   # File Column
>   #
>   file_column :image,
>     :permission => "0664",
>     :magick => {
>       :versions => {
>         :full => { :size => ''400x300>''},
>         :square => { :crop => ''1:1'', :size =>
''90x90!'' },
>         :icon => { :crop => ''1:1'', :size =>
''60x60!'' }
>     }
>   }
>
>   #
>   # Before, During & After
>   #
>   before_create :watermark_image
>
>   #
>   # Validations
>   #
>   validates_file_format_of :image,
>     :in => [''jpg'', ''png'',
''gif''], :message => ''must be jpg, png or
gif''
>
>   #
>   # Private Methods
>   #
>   private
>   def watermark_image
>     #require ''RMagick''
>     dst = Magick::Image.read(self.image).first
>     src >
Magick::Image.read("#{RAILS_ROOT}/public/images/watermark.png").first
>
>     result = dst.composite(src, Magick::CenterGravity,
> Magick::OverCompositeOp)
>     result.write(self.image)
>   end
>
> end
>
> --
> Posted via http://www.ruby-forum.com/ .
>
> >
>

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kaiye85-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2006-Nov-17 04:21 UTC

head link

Re: file_column and image watermarks

I did it by doing this


 after_save :watermark_on_image

 private
    def watermark_image
    #original photo
        dst = Magick::Image.read(self.image).first
        src
Magick::Image.read("#{RAILS_ROOT}/public/images/watermark.jpg").first
        result = dst.composite(src, Magick::SouthEastGravity,
Magick::OverCompositeOp)
        result.write(self.image)
    #medium
        medium  
"#{RAILS_ROOT}/public/photo/image/#{self.id}/medium/#{File.basename(self.image)}"
        dst = Magick::Image.read(medium).first
        src
Magick::Image.read("#{RAILS_ROOT}/public/images/watermadrk.jpg").first
        result = dst.composite(src, Magick::SouthEastGravity,
Magick::OverCompositeOp)
        result.write(medium)   
       
    end


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Rails - Nov 2006 - file_column and image watermarks

file_column and image watermarks

Re: file_column and image watermarks

Re: file_column and image watermarks