(1) NTSC is a research group set up by leading equipment manufacturers and
The group examines all aspects of television, such as frequency,
bandwidth, quality, power, color, and methods of transmission.
(2) The area within the triangle represents the range of colors that are
obtainable when these primaries are used.
In the NTSC triangle, red has a
wavelength of approximately 610 nanometers, green is approximately 540 nanometers,
and blue is approximately 470 nanometers. At first glance, this triangle appears
much smaller than the spectrum of colors obtainable when ideal primaries are used.
But, if you give Figure 1-9 a close inspection, you see that the NTSC primaries
fall very close to saturated colors on the chromaticity curve.
The red primary,
for example, is actually on the curve.
CIR chromaticity diagram and the NTSC triangle