function Generate_colorbar(filename)
if nargin == 0
    filename = 'colormap.svg';
end

  T={ ...
    'jet'
    'hsv'
    'hot'
    'cool'
    'spring'
    'summer'
    'autumn'	
    'winter'
    'gray'
    'bone'
    'copper'
    'pink'
    'lines'
    'colorcube'
    'flag'
    'prism'
	};    

fid = fopen(filename,'w');
fprintf(fid,'<?xml version="1.0" encoding="UTF-8" standalone="no"?>\n');
fprintf(fid,'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n');
fprintf(fid,'<svg\n');
fprintf(fid,'\txmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\n');
fprintf(fid,'\txmlns:svg="http://www.w3.org/2000/svg"\n');
fprintf(fid,'\txmlns="http://www.w3.org/2000/svg"\n');
fprintf(fid,'\twidth="512px"\n');
fprintf(fid,'\theight="%dpx">\n',36*numel(T));
fprintf(fid,'\t\n');
fprintf(fid,'\t\n');

for j=1:numel(T)
    cmap = colormap(T{j});
    fprintf(fid,'\t<g id="g_%s">\n',T{j});
    for i=1:size(cmap,1)
        colorname = sprintf('%02x%02x%02x',...
            fix(cmap(i,1)*255),fix(cmap(i,2)*255),fix(cmap(i,3)*255));
        fprintf(fid,'\t\t<rect\n');
        fprintf(fid,'\t\t\tid="rect%d"\n',1000+64*(j-1)+i);
        fprintf(fid,'\t\t\tx="%d"\n',8*(i-1));
        fprintf(fid,'\t\t\ty="%d"\n',36*(j-1));
        fprintf(fid,'\t\t\theight="32"\n');
        fprintf(fid,'\t\t\twidth="9"\n');
        fprintf(fid,'\t\t\tstyle="fill:#%s" />\n',colorname);   
    end
    fprintf(fid,'\t\t</g>\n\n');
end
fprintf(fid,'</svg>\n');
fclose(fid);