ruby on rails - How do I apply a drop shadow to thumbnails using imagemagick and paperclip? -

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I would like to change the processing of thumbnails in Pemelclip, which will apply a drop-side to all image thumbnails. What I am stuck is the real image magnetic command that will close this small miracle. Whatever I have tried, it returns a wrongly scaled drop shadow without the original image. 

  DF Transformation_anomic scale, crop = current_jammetry.transivation_to (target_geometry, crop?) Trans = "" trans & lt; & Lt; "-Resage \" # {scale} \ "" trans & lt; & Lt; "-crop \" # crop) \ "+ repape" if crop # drop shadow transpole apply & lt; & Lt; "# {Convert_options}" If Convert_section? I have tried ...  
  DF Transformation_ Size scale, crop = current_jammetry.transensfarm_to (@ target_gementory, crop) trans = "" Trans & lt; & Lt; "-Resage \" # {scale} \ "" trans & lt; & Lt; "-Crop \" # {crop} \ "+ repep" if crop trance; & Lt; & Lt; "\ (+ Clone-background black-side 60x5 + 10 + 10 \) + swap-background no-none merge player +" trans & lt; & Lt; "# {Convert_options}" If Convert_section? Transamat end  
 
 I'm totally new to Image Magazine, any help would be greatly appreciated.

After some trial and error and after burying my head in the docks, I finally thought Was there. 

  has_attached_file: image ,: styles = & gt; {: Thumb = & gt; ["100x100 #" ,: png]},: convert_pipation => {: Thumb = & gt; '\ (+ Clone-background black-analogy 70x4 + 0 + 0 \) + Do not mix any players of swap-background + repage'}
  1. Make sure you have Install the latest version of Image Magic.
  2. ["100x100 #", png] The image must be converted to png so that the drop side is transparent.
  3. Under the convert options, thumbs will apply only to apply the conversion of all your styles: use the thumb style.
  4. Tap "70x4 + 0 + 0" to get the shade you want.

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