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showing K means clusters image in colors rather than grey scale

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cgenes on 1 Dec 2016
Commented: cgenes on 1 Dec 2016
I have clustered my image into 8 different clusters
pixel_labels = reshape(cluster_idx,nrows,ncols);
imshow(pixel_labels,[]), title('image labeled by cluster index');
but I want to display 8 different colors something like . . .
imshow(pixel_labels,'colormap', hot(8))
then show the colorbar
I know this should be easy but can't figure it out

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