After testing some different pictures, I found this application not only can afford a paragon for the students learning how to draw a real sketch from a color picture, but also is a very effective tool for extracting most important features from a color picture. As a result, it can be used as a key step in the field of computer vision such as vision surveillance and face recognition. Compared with the well known edge detection algorithms, this sketch Maker can give much clearer contour of wide variety of objects including the natural scenery and artistic works. Besides, in this new version, the sketchMaker has deep contrast , 3-tone sketch and noise reduction option, which makes the image not only have its different edge, but also reflect real bright scale of the objects in the original pictures, for example, the black hairs or clothes, etc. I think It will be also very interesting for amateur photographer. I like it very much.