Outliner is a Photoshop-compatible plug-in that can work with commercial software like Adobe Photoshop and Corel Paint Shop Pro, or free like software IrfanView and XnView.
It gives a user the easiest way to get image contouring with desired quality. It just picks out various edges making them more expressive. The user can easily manage range of edge appearance in the processed image getting fantastic artistic effects.
Outliner can be very useful plug-in for web designers creating graphic icons and for artists dealing with engraving.