National Instruments Printer PCI-1405 User Manual download pdf (Page 18)

Introduction to Color

Color is the wavelength of the light we receive in our eye when we look at

an object. In theory, the color spectrum is infinite. Humans, however, can

see only a small portion of this spectrum—the portion that goes from the

red edge of infrared light, which is the longest wavelength, to the blue edge

of ultraviolet light, which is the shortest wavelength. This continuous

spectrum is called the visible spectrum, as shown in Figure A-1.

Figure A-1. White Light and the Visible Spectrum

White light is a combination of all colors at once. The spectrum of white

light is continuous and goes from ultraviolet to infrared in a smooth

transition. You can represent a good approximation of white light by

selecting a few reference colors and weighting them appropriately.

The most common way to represent white light is to use three reference

components, such as red, green, and blue (R, G, and B primaries). You

can simulate most colors of the visible spectrum using these primaries.

For example, video projectors use red, green, and blue light generators,

and an RGB camera uses red, green, and blue sensors.

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National Instruments Printer PCI-1405 User Manual Page 18