Size of frame buffer of raster systems

Question

Consider three several raster systems with resolutions of 640 x 480, 1280 x 1024, and 2560 x 2048.

a) What is the size of frame buffer (in bytes) for each of these systems in order to store the 12 bits per pixel?

Answer 1

Since the eight bits constitute a byte, frame-buffer sizes of systems are given as follows:

640 x 480 x 12 bits / 8 = 450KB;

1280 x 1024 x 12 bits / 8 = 1920KB;

2560 x 2048 x 12 bits / 8 = 7680KB;