R – Paperclip save images as jpg with white background

imagemagickpaperclippost-processing

I'd like to know how to convert png and gif files with alpha channel to jpg with white background with paperclip

I tried this but, it doesn't work 

has_attached_file( 
  :photo, 
  :whiny => false, 
  :styles => { 
    :medium => ["300x300>", :jpg], 
    :thumb => ["100x100>", :jpg] 
  }, 
  :convert_options => { :all => '-alpha white -background white'}
)

It saves the file with the gray background.

Best Answer

-alpha remove -background white is preferable. white is not a valid argument for -alpha.

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