ciespec2aopic
The ciespec2aopic function derives the \alpha-opic quantities from any given spectral power distribution(s). Any errors in the data set or in results generated with the Lighting Toolbox are not in the liability of the CIE nor me, see licence.
Note: the result is given in \textrm{W}\cdot \textrm{m}^{-2} , in literature the results are often given in \textrm{mW}\cdot \textrm{m}^{-2} .
Usage:
aopic = ciespec2aopic(lam,spec)
Where:
| Parameter | Description |
aopic | Is the return vector/matrix containing the \alpha-opic values in the following order: sc, mc, lc, rh, mel |
lam | Specifies the wavelengths. |
spec | Specifies the spectral power distribution (SPD) |
Examples
Derive \alpha-opic values from standard illuminant ‘A’ with illuminance of E = 100~\textrm{lx}:
lam = 360:830; spec = ciespec(lam,'A',100); aopic = ciespec2aopic(lam,spec)
Result:
aopic = 0.025412 0.117421 0.165670 0.083070 0.065744
Derive \alpha-opic values from standard illuminant ‘D55’, ‘D65’ and ‘D75’ with illuminances of E = 100~\textrm{lx}:
lam = 360:830;
spec = ciespec(lam,{'D55','D65','D75'},100);
aopic = ciespec2aopic(lam,spec)
Result:
aopic = 0.068531 0.141099 0.162862 0.133744 0.119892 0.081729 0.145582 0.162890 0.144970 0.132621 0.092530 0.148941 0.163030 0.153757 0.142691
This means:
E_{v,sc}^{D55} = 68.531~\textrm{mW}\cdot \textrm{m}^{-2} \qquad \dots \qquad E_{v,mel}^{D55} = 119.892~\textrm{mW}\cdot \textrm{m}^{-2} E_{v ,sc}^{D65} = 81.729~\textrm{mW}\cdot \textrm{m}^{-2} \qquad \dots \qquad E_{v,mel}^{D65} = 132.621~\textrm{mW}\cdot \textrm{m}^{-2} E_{v ,sc}^{D75} = 92.253~\textrm{mW}\cdot \textrm{m}^{-2} \qquad \dots \qquad E_{v,mel}^{D75} = 142.691~\textrm{mW}\cdot \textrm{m}^{-2}Reference:
ISO/CIE 11664-1:2019(E): Colorimetry – Part 1: CIE standard colorimetric observers. Commission International de l’Éclairage (CIE), Vienna Austria, 2019. URL: https://cie.co.at/publications/colorimetry-part-1-cie-standard-colorimetric-observers-0