A resolution of 640 x 480.

Is a printing technique where the edges of the picture are gradually faded out to black or white. It also refers to a fall off in illumination at the edges of an image, such as may be caused by a lens hood or similar attachment partially blocking the field of view of the lens.

A feature of some applications (and System 7) that lets you use hard disk space as RAM.

The portion of the electromagnetic spectrum that the human eye can see.

"The electomagnetic spectrum of visible light