23.2 Scintillators
643
(a)
(b)
(c)
Fig. 23.3 CIE chromaticity diagram from 1931 a in the coordinates x and y and from 1976 b in the coordinates u and
v (23.3b). The curved upper boundary is called the ‘spectrum locus’ and contains monochromatic colors, the straight
line at the lower left is termed the ‘purple boundary’. In the graph also the color of blackbody radiation is given,
T = 5440 K corresponds to x = y = 1/3. ‘A’, ‘B’, ‘C’, and ‘E’ are standard illuminants, ‘D65’ denotes daylight with
color temperature T = 6500 K. c CIE chart with the color ranges of sRGB, CIE and NTSC. Part c adapted from [1931]
Table 23.2 Primaries and white points for sRGB, CIE and NTSC
Primary
Red
Green
Blue
White
CIE
0.73467
0.26533
0.27376
0.71741
0.16658
0.00886
0.33333
0.33333
NTSC
0.6700
0.3300
0.2100
0.7100
0.1400
0.0800
0.3100
0.3160
sRGB
0.6400
0.3300
0.3000
0.6000
0.1500
0.0600
0.3127
0.3290