I can see how this is useful for laypeople. Those with a DIY attitude might resort to popular image editing tools. My choice would be trying to achieve this with Imagemagick. Fred Weinhaus' script http://www.fmwconcepts.com/imagemagick/skew/index.php and maybe adding a blur later.
Wow! What a great find! I wish more documentation looked like this. There are a few other (feature-rich) command line utilities that could benefit from a similar approach.