Graphics, Imaging, and Games Lab

Conventional tone-preserving stippling struggles with extreme-tone regions. Dark regions require immense quantities of stipples,
while light regions become littered with stipples that are distracting and, because of their low density, cannot communicate
any image features that may be present.
We propose a method to address these problems, augmenting existing stippling methods. We will cover dark regions with solid
polygons rather than stipples; in light areas, we both preprocess the image to prevent stipple placement in the very lightest
areas and postprocess the stipple distribution to remove stipples that contribute little to the image structure. Our modified
stipple images have better visual quality than the originals despite using fewer stipples.