Homepage › Forums › RetroPie Project › Ideas for Further Enhancements › Suggestion: Different images for MAME/Advance MAME › Reply To: Suggestion: Different images for MAME/Advance MAME
Blur is more of a gimp thing. I use Gaussian blur at a setting of around 15-18:
http://docs.gimp.org/en/plug-in-gauss.html
And gimp of course is also free :D