An Illustrated Guide
Figure 1. You don't need two eyes to look angry! | There are two key criteria that we use to judge the quality of a particular facial expression: clarity and intensity. If a face has high clarity, more than 80-90% of viewers will agree on the emotion it is portraying. Intensity, on the other hand, is a measure of how strong that emotion appears to be. As you might imagine, faces with high intensity generally also have high clarity, and less intense faces are somewhat harder to interpret. But not necessarily! With certain expressions, like anger, it is possible to have faces with both low intensity and high clarity, allowing an artist or animator to successfully portray a full range of emotional states, from mere irritation to full-on rage like our one-eyed, mythological friend, the Cyclops (Figure 1). |