SquiggleDraw will create a SVG file from an image, using the brightness to change the amplitude of sine waves. It is easier to look at the examples below to better understand. 🙂 You can use the saved SVG file to print from Inkscape/AI/etc, draw with a pen on a pen plotter (like the awesome AxiDraw), or engrave with a lasercutter (it looks cool!)
StippleGen is a free, open source, and cross-platform application from Evil Mad Scientist Laboratories that can create stipple drawings and ” TSP art,” from image files. One of the perennial problems that we have come across in a variety of contexts, including CNC artwork and producing artwork for the Egg-Bot, is the difficulty of creating good-quality toolpaths- i.e., vector artwork representing halftones -when starting from image files.