Legit

I do a great deal of image making on the iPod touch in the form of photographing sketches, filtering the drawings and painting into them with programs like Autodesks Sketchbook. Filterstorm has become my constant companion for tweaks and adjustments, allowing me to produce images on a small scale with some impressive end results. If you are into multimedia or digital painting on iOS you should seriously consider adding this to your toolbox. Constant updates and attention from the developer is the icing on this rather powerful cake.

The tutorial videos are very explanatory and I encourage you to check them out.

Veathn about Filterstorm, v4.1