frudawski

plotspecslice

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:

ParameterDescription
lamSpecifies the spectra wavelengths.
specIs the input spectra matrix.
label
(optional)
Defines the colour bar label.
max
(optional)
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

Leave a comment

* I accept the use of cookies as well as the terms in the privacy policy. I accept that data provided by me is processed and saved. I know that comments are saved and published after review.