InstantPhotoSketch is an image editing tool that can replicate a pencil sketch. It can convert images in PNG, JPG, BMP, JPEG, TIFF, TIF and GIF and process them one at a time. In other words, it does not support a batch-mode, but that really isn't a big deal.
When you launch InstantPhotoSketch, you have to tell it what picture you want it to work on. When you do that, a preview will appear. By simply clicking on the start button, the image is rendered to look like a drawing made with a pencil. What really happens is that all the edges of everything on the picture are highlighted and the rest of the image undergoes a color change to look white. There is a sliding bar that you can use to increase or decrease the detail of the drawing. If you move the bar to the right, more details will show, mainly because more black dots will appear.
All in all, this is a fun tool for occasional use. The effect achieved is nice, but it is not the best that I have seen. I probably have seen web apps that can do a better job. Still, someone probably worked hard to make this app, and credit goes out for that. On the bright side, the application is quick to load and very intuitive. It can export the sketches to JPEG files.