Calligraphic and Raster Devices

Calligraphic Display Devices

draw polygon and line segments directly:

• Plotters
• Direct Beam Control CRTs
• Laser Light Projection Systems

Raster Display Devices

represent an image as a regular grid of samples.

• Each sample is usually called a pixel or, less commonly, a pel.
• Both are short for picture element.
• Rendering requires rasterization algorithms to quickly determine a sampled representation of geometric primitives.