%
% Here is an example of the kind of experiments students faced at the
% "Color Vision" course based on COLORLAB:
%
% EDIT THE PERCEPTUAL DIMENSIONS OF AN IMAGE IN A COLOR APPEARANCE SPACE
% (such as CIELab)
%

% ADD AND INITIALIZE COLORLAB
addpath(genpath('C:\disco_portable\mundo_irreal\jesus\WEBS\isp\jesus_long_bio\colorlab'))
startcol

% READ IMAGE
im = imread('C:\disco_portable\mundo_irreal\jesus\WEBS\isp\jesus_long_bio\fotos_definitivas\alumna.JPG');

% SELECT 500 COLORS PALETTE MINIMIZING THE VARIANCE
[imi,map] = true2pal(im,500);

imt = pal2true(imi,map);
figure,image(imt)

% EXPRESS COLORS IN CIEXYZ
T=val2tri(map,Yw,tm,a,g); 

% SELECT SOME COLORS (e.g. the RED shirt)
t = tri2coor(T,Yw);
lpY=coor2lp(t,1,T_l,Yw);
 
imlpy = pal2true(imi,lpY);
figure,subplot(131),colormap gray,imagesc(imlpy(:,:,1))
       subplot(132),colormap gray,imagesc(imlpy(:,:,2)>0.79)
       subplot(133),colormap gray,imagesc(imlpy(:,:,3))
       
rojos = find(((lpY(:,1) < 0)|(lpY(:,1) > 600))&(lpY(:,2) > 0.7));

figure,colordgm(T,1,T_l,Yw,'symb','s','sizes(3)',2,'showtriang',{2,tm})
hold on,colordgm(T(rojos,:),1,T_l,Yw,'symb','s','sizes(3)',2,'showtriang',{2,tm},'linecolors(7,:)',[1 0 0])

TT = T;
TT(rojos,:) = zeros(length(rojos),3);

[n,saturat,Tn]=tri2val(TT,Yw,tm,a,g,8);

imtt = pal2true(imi,n);
figure,image(imtt)

% EXPRESS COLORS IN CIELAB

W = [max(T(:,2)) max(T(:,2)) max(T(:,2))];

lab = xyz2lab(T,W);

LhC=lab2perc(lab);

angle = linspace(0,2*pi,8);
factor_L = linspace(0.35,1.6,7);
factor_C = linspace(0,1.5,7);

% LOOP OVER HUE

for i=1:length(angle)-1
    LhC2 = LhC;
    LhC2(rojos,2) = LhC(rojos,2)+angle(i);
    lab2 = perc2lab(LhC2);
    T2 = lab2xyz(lab2,W);
    [n,saturat,Tn]=tri2val(T2,Yw,tm,a,g,8);
    imtt = pal2true(imi,n);
    figure,image(imtt)
    imwrite(imtt,['C:\disco_portable\mundo_irreal\jesus\WEBS\isp\jesus_long_bio\fotos_definitivas\alumna_h_',num2str(i),'.JPG'])
end

% LOOP OVER LIGHTNESS

for i=1:length(factor_L)
    LhC2 = LhC;
    LhC2(:,1) = factor_L(i)*LhC(:,1);
    lab2 = perc2lab(LhC2);
    T2 = lab2xyz(lab2,W);
    [n,saturat,Tn]=tri2val(T2,Yw,tm,a,g,8);
    imtt = pal2true(imi,n);
    figure,image(imtt)
    imwrite(imtt,['C:\disco_portable\mundo_irreal\jesus\WEBS\isp\jesus_long_bio\fotos_definitivas\alumna_L_',num2str(i),'.JPG'])
end

% LOOP OVER CHROMA

for i=1:length(factor_C)
    LhC2 = LhC;
    LhC2(:,3) = factor_C(i)*LhC(:,3);
    lab2 = perc2lab(LhC2);
    T2 = lab2xyz(lab2,W);
    [n,saturat,Tn]=tri2val(T2,Yw,tm,a,g,8);
    imtt = pal2true(imi,n);
    figure,image(imtt)
    imwrite(imtt,['C:\disco_portable\mundo_irreal\jesus\WEBS\isp\jesus_long_bio\fotos_definitivas\alumna_C_',num2str(i),'.JPG'])
end