The plotspecslice function creates an illustration of spectral false colour slices of several input spectra. The spectral intensity is displayed via the false colours and the corresponding colour bar.
Usage:
plotspecslice(lam,spec,label,max)
Where:
| Parameter | Description |
lam | Specifies the spectra wavelengths. |
spec | Is the input spectra matrix. |
label | Defines the colour bar label. |
max | Sets the colour bar maximum. |
Examples
Plot normalized black body spectra:
% define lambda
lam = 380:780;
% define CCTs
T = [3000:500:9000];
% get black body spectra
spec = planck(T,lam);
% normalize spectra
spec = spec./max(spec')';
% plot spectral slices
plotspecslice(lam,spec)
% set y-labels
yticklabels(T)
ylabel('CCT')
See also: planck
Result:
One can see, that with increassing temperatures the spectral power maximum is shifting to lower wavelengths.
Plot diverse daylight spectra and set colourbar label and maximum:
% define wavelengths
lam = 380:780;
% define CCTs
T = [5000:1000:15000];
% create daylight spectra
spec = ciecct2spec(T,lam);
% plot spectral slices
plotspecslice(lam,spec,'SPD',200);
% add title and y-labels
title('spectral power distribution (SPD) of daylight, normalized at 560 nm')
ylabel('CCT')
yticklabels(T)
See also: ciecct2spec
Result:
Plot spectral reflectance values of the CIE colour fidelity index references:
lam = 380:780; spec = ciespec(lam,'CFI'); plotspecslice(lam,spec,'spectral reflectance')
See also: ciespec
