- •4 Color appearance models
- •4.1 General requirements for color appearance models
- •4.2 Cielab Model
- •Inverse conversion equations
- •4.3 Cieluv Model
- •Inverse conversion equations
- •4.4 Ciecam02 Model
- •Categorical viewing conditions settings for the model
- •Unique hue data for the calculation of hue quadrature
- •Inverse conversion equations
- •4.5 Modification of ciecam02 by Luo et al.
- •Table 4.1
- •Values of lightness for spectral colours
- •Table 4.2
- •Values of colorfulness for spectral colours
- •Table 4.2 (End)
- •Table 4.3 Values of criterion
- •Table 4.4 (End)
- •Таble 4.7 Values of distance between position of points of monochromatic colors of chromaticity diagram for combined adapting luminance and surround for stimulus luminance, equal 10 cd/m2
- •Table 4.9 Values of distance between position of points of monochromatic colors of chromaticity diagram for stimulus luminance, equal 20 и 200 cd/m2 for stimulus luminance, equal 50 cd/m2
- •Table 4.11 Values of distance between position of points of monochromatic colors of chromaticity diagram for combined adapting luminance and surround for stimulus luminance, equal 50 cd/m2
- •Table 4.12
- •Figure 4.19 ‒ Occurrence of image impairment in dependence of colour deflection levels
- •4.6 High-Luminance Color Appearance Model
- •Inverse model computation:
Table 4.2
Values of colorfulness for spectral colours
LA, cd/m2 |
|
White D65 |
||||||||||||||
450 |
490 |
500 |
520 |
550 |
580 |
650 |
||||||||||
Y=10 |
||||||||||||||||
20 |
107.85 |
74.09 |
74.809 |
84.67 |
78.923 |
62.074 |
136.12 |
1.1869 |
||||||||
50 |
116.26 |
80.137 |
80.897 |
91.601 |
85.468 |
67.513 |
147.68 |
0.9578 |
||||||||
100 |
122.97 |
84.992 |
85.778 |
97.146 |
90.719 |
71.999 |
157.087 |
0.6228 |
||||||||
200 |
130.07 |
90.14 |
90.951 |
103.022 |
96.291 |
76.772 |
167.024 |
0.2472 |
||||||||
Y=50 |
||||||||||||||||
20 |
166.41 |
115.84 |
116.93 |
132.73 |
124.36 |
98.15 |
213.39 |
1.852 |
||||||||
50 |
178.83 |
124.93 |
126.03 |
143.1 |
134.26 |
106.46 |
230.59 |
1.489 |
||||||||
100 |
188.67 |
132.2 |
133.3 |
151.35 |
142.17 |
113.31 |
244.52 |
0.966 |
||||||||
200 |
199.04 |
139.89 |
140.97 |
160.07 |
150.55 |
120.59 |
259.18 |
0.382 |
||||||||
Table 4.2 (End)
Y=100 |
||||||||
20 |
199.43 |
139.75 |
140.96 |
160.16 |
150.5 |
119.05 |
257.26 |
2.23 |
50 |
213.93 |
150.49 |
151.68 |
172.37 |
162.25 |
128.99 |
277.47 |
1.791 |
100 |
225.38 |
159.08 |
160.21 |
182.08 |
171.64 |
137.18 |
293.8 |
1.16 |
200 |
237.4 |
168.12 |
169.19 |
192.3 |
181.55 |
145.87 |
310.91 |
0.458 |
Table 4.3 Values of criterion
|
|||||||
|
450 |
490 |
500 |
520 |
550 |
580 |
650 |
10 |
6.05 |
5.58 |
5.58 |
5.84 |
5.80 |
6.17 |
6.92 |
50 |
6.52 |
6.15 |
6.11 |
6.31 |
6.36 |
6.98 |
7.18 |
100 |
6.67 |
6.31 |
6.24 |
6.43 |
6.54 |
7.27 |
7.21 |
TABLE
4.4
Colour coordinates
of
monochromatic colour points
of chromaticity diagram for Y=10
Surround |
LA, cd/m2 |
|
||||||||
380 |
485 |
495 |
||||||||
|
|
|
|
|
|
|
|
|
||
average |
20 |
39.30 |
‒53.99 |
38.21 |
‒38.27 |
‒22.71 |
34.89 |
‒42.77 |
‒5.74 |
35.68 |
200 |
45.48 |
‒57.84 |
36.39 |
‒43.25 |
‒25.45 |
35.04 |
‒48.30 |
‒6.37 |
35.86 |
|
dim |
20 |
38.28 |
‒54.65 |
45.95 |
‒38.48 |
‒22.91 |
41.62 |
‒43.01 |
‒5.85 |
42.36 |
200 |
43.94 |
‒59.00 |
44.58 |
‒43.46 |
‒25.68 |
41.77 |
‒48.55 |
‒6.50 |
42.55 |
|
dark |
20 |
36.46 |
‒53.88 |
51.64 |
‒37.55 |
‒22.43 |
46.53 |
‒41.98 |
‒5.78 |
47.22 |
200 |
41.63 |
‒58.52 |
50.62 |
‒42.46 |
‒25.18 |
46.69 |
‒47.44 |
‒6.44 |
47.41 |
|
Surround |
LA. cd/m2 |
|
||||||||
515 |
550 |
580 |
||||||||
|
|
|
|
|
|
|
|
|
||
average |
20 |
‒42.87 |
18.09 |
36.54 |
‒29.41 |
34.25 |
38.29 |
‒0.79 |
38.66 |
40.61 |
200 |
‒48.13 |
20.54 |
36.76 |
‒32.89 |
38.91 |
38.55 |
‒0.67 |
44.37 |
40.90 |
|
dim |
20 |
‒43.12 |
18.07 |
43.19 |
‒29.64 |
34.19 |
44.87 |
‒0.99 |
38.42 |
47.09 |
200 |
‒48.41 |
20.50 |
43.41 |
‒33.17 |
38.81 |
45.12 |
‒0.91 |
44.04 |
47.36 |
|
dark |
20 |
‒42.16 |
17.55 |
48.00 |
‒29.04 |
33.19 |
49.60 |
‒1.15 |
37.11 |
51.70 |
200 |
‒47.39 |
19.91 |
48.22 |
‒32.58 |
37.70 |
49.84 |
‒1.12 |
42.57 |
51.96 |
|
