Real-Time Halftoning: Fast and Simple Stylized Shading
Bert Freudenberg, Maic Masuch, Thomas Strothotte · 2004
Introduction In this gem we introduce a technique borrowed and adapted from non-interactive hardcopy to real-time environments. Similar approaches comparable to the one presented in this gem are great resources for inspiration. Some are less flexible [Lake00, Praun01] while others are more complicated [Webb02]. Halftoning in its original form is the procedure used to print images with gray levels using only black ink. It does so by varying the size of ink dots, and thus, the ratio of paper area to inked area. Viewed from a distance, a certain tone is perceived. A similar effect is used when an artist is drawing a picture with pen and ink, where more lines are put in areas that should appear darker. Yet another variation is employed in engravings or wood cuts, where the width of lines is adjusted to depict variations in shading. All these styles can be recreated by applying real-time halftoning. Similar to traditional halftoning, when the image intensity changes in a given neighborhood