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1. Add a blurry shadow under an image

   $ convert picture.jpg \
   \( +clone -background black -shadow 70x4+5+5 \) +swap \
   -background none -flatten -trim +repage picture.png
   

2. Convert a png file into jpg, replace alpha background with white

   $ convert foo.png -resize 500x400 -background white -flatten foo.jpg
   

   Source: http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=8359