Spatiotemporal resolution, grayscales, gamma (part II)

CS 248 - Introduction to Computer Graphics
Spring Quarter, 1995
Marc Levoy
Lecture notes for Thursday 20 (part II)

Table of contents:

• Temporal resolution - How many frames per second?
  1. Flicker sensitivity - refresh rate
  2. Motion perception - update rate
  3. Motor-visual correlation - lag time
• Intensity quantization - How many bits per pixel?
  1. Television chain
  2. Graphics chain
  3. Quantization for graphics
  4. So how many bits?

Press here for Part I of this lecture.

So how many bits per pixel?

• Synthetic images: 6-8 bits. Some people claim they need more.
• Scanned/painted images: 5 bits usually ok. Why? Noise breaks up contouring artifacts.
• Antialiased edges: 3 bits suffice! Why? Shorter distance, so contours are compressed.