Creates a color palette (i.e. colormap) by selecting points on an image

paletteMaker.m

function mypal = paletteMaker(paletteImPath)
% input: image path for your palette
% output: color palette as a colormap

im = imresize(imread(paletteImPath),0.5);
figure;
imshow(im);
[xs,ys,mypal] =  impixel();

for iColor = 1:size(mypal,1)
    im = insertShape(im,'filledcircle',[xs(iColor) ys(iColor) size(im,1)/40],...
        'color',mypal(iColor,:),'opacity',1);
    im = insertShape(im,'circle',[xs(iColor) ys(iColor) size(im,1)/40],...
        'color','black','lineWidth',10);
    imshow(im);
end