Table 2. Coordinates and 95% confidence intervals for the four control points defining each Bézier curve fitting the OECF curves for two camera models.
| Channel | Parameter | P0 | P1 | P2 | P3 | |
| ‘Red’ |
|
μ95% CI | 1.09×10−2
 1.91×10−4
|
1.31×10−2
 5.19×10−4
|
2.74×10−2
 1.07×10−3
|
1.87×10−2
 1.30×10−3
|
|
μ95% CI | 2.20×10−1
 3.85×10−3
|
2.73×10−1
 6.10×10−3
|
8.66×10−1
 3.55×10−3
|
9.62×10−1
 1.09×10−3
|
|
| ‘Green’ |
|
μ95% CI | 1.21×10−2
 2.40×10−4
|
1.18×10−2
 5.15×10−4
|
4.68×10−2
 9.35×10−4
|
1.96×10−1
 5.61×10−4
|
|
μ95% CI | 2.29×10−1
 4.03×10−3
|
3.02×10−1
 6.00×10−3
|
8.34×10−1
 3.51×10−3
|
9.40×10−1
 5.44×10−4
|
|
| ‘Blue’ |
|
μ95% CI | 1.25×10−2
 2.49×10−4
|
1.45×10−2
 8.46×10−4
|
5.40×10−2
 1.86×10−3
|
2.33×10−1
 1.67×10−3
|
|
μ95% CI | 2.18×10−1
 3.65×10−3
|
3.11×10−1
 5.61×10−3
|
8.28×10−1
 3.29×10−3
|
9.42×10−1
 1.05×10−3
|
|
| ‘Red’-UV |
|
μ95% CI | 2.02×10−2
 4.61×10−4
|
3.70×10−2
 1.51×10−3
|
7.04×10−2
 3.49×10−3
|
2.37×10−1
 3.20×10−3
|
|
μ95% CI | 2.40×10−1
 4.66×10−3
|
3.21×10−1
 7.34×10−3
|
8.65×10−1
 3.83×10−3
|
9.58×10−1
 2.52×10−3
|
Mean coordinates (μ) and 95% confidence intervals (CI) for the four control points defining cubic Bézier curves fitting the OECF curves reconstructed for the colour channels of a Canon 40D camera and the ‘red’-UV channel of a modified Nikon D70s. Coordinates of the first and last control points correspond to the normalised minimum and maximum camera responses included in the OECF and the normalised exposure required to obtain them. Exposure values (
) are expressed in 
mol units and camera responses (
) in normalised pixel intensity levels.