Computer graphics is the art and science of creating imagery by computer

4 Basic Elements of CG

Output Devices

Cathode Ray Tube(CRT)

to the viewer, it’s like a dot moving rapidly in the display

Raster CRTs (n x m phosphor)

made pixel display available

have the problem of scan conversion - convert the desired shape into pixel display

Aliasing(staircase effect) - line or curve cannot be perfected represented by the pixels.

Memory Speed & Space Requirements

Memory space per second = (n * m * b * r) / 8 bytes

if non-interlaced, memory read time = 1 / (n * m * r) secs/pixel