lambda2rg.m

%LAMBDA2RGB RGB chromaticity coordinates
%
% RGB = LAMBDA2RG(LAMBDA) is the rg-chromaticity coordinate (1x2) for
% illumination at the specific wavelength LAMBDA [m]. If LAMBDA is a vector
% (Nx1), then P (Nx2) is a vector whose elements are the chromaticity
% coordinates at the corresponding elements of LAMBDA.
%
% RGB = LAMBDA2RG(LAMBDA, E) is the rg-chromaticity coordinate (1x2) for an
% illumination spectrum E (Nx1) defined at corresponding wavelengths LAMBDA
% (Nx1).
%
% References::
%  - Robotics, Vision & Control, Section 10.2,
%    P. Corke, Springer 2011.
%
% See also CMFRGB, LAMBDA2XY.

% Copyright 2022-2023 Peter Corke, Witold Jachimczyk, Remo Pillat

function [r,g] = lambda2rg(lambda, e)
    if nargin == 1,
        RGB = cmfrgb(lambda);
    elseif nargin == 2,
        RGB = cmfrgb(lambda, e);
    end
    cc = tristim2cc(RGB);

    if nargout == 1
        r = cc;
    elseif nargout == 2
        r = cc(:,1);
        g = cc(:,2);
    end