PencilSketch is a powerful app to turn your digital photos into pencil sketches. It's very ease to use; to sketch a photo you just need drop the photo into PencilSketch. The app produces natural pencil sketch fast, as nearly all of the processing is in real time. PencilSketch supports photos of all sizes and many image formats, like JPG, TIFF, PNG, and BMP. You can share your picture sketch on Facebook or Twitter, or send it to your friend by Email or iMessage.