Perceivable by the eye; capable of being seen; perceptible; in view; as, a visible star; the least spot is visible on white paper.
The region of the electromagnetic spectrum which is visible by the human eye. Light in the visible region falls between 400-700 nm.
Visible wavelengths range from 0.4 to 0.7 µm. If only one sensor receives from these wavelengths you will see grayscales, not colour. Colour requires scanners with sensors at each of the wavelengths for the colours to be combined. See also IR and WV.
The small range of the electromagnetic spectrum that human eyes perceive as light. The visible spectrum ranges from about 400 to 700 nm, corresponding to blue through red light.