Sort a Hex color vector by hue

sort_by_hue.m

% JN Kather 2015
% sorts a vector of hex colors by hue
% dependencies: needs functions rgb2hex and hex2rgb

dataDir = 'input/data/';

% read color vector
colorList = readtable(strcat(dataDir,'/custom_color_list3.txt'),... 
         'ReadVariableNames',false); 
     
% preallocate
colors_HSV = zeros(numel(colorList),3);

% convert to HSV
for i=1:numel(colorList)
    colors_HSV(i,:) = rgb2hsv(hex2rgb(char(colorList.Var1(i))));
end

% sort by hue
colors_HSV = sort(colors_HSV,1);

% convert back to Hex RGB
for i=1:numel(colorList)
    colorsListOut(i) = cellstr(rgb2hex(hsv2rgb(colors_HSV(i,:))));
end

% print
disp(colorsListOut');