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function image_rgb(M)
% Show a matrix of integers as a color image.
% This is like imagesc, except we know what the mapping is from integer to color.
% If entries of M contain integers in {1,2,3}, we map
% this to red/green/blue
cmap = [1 0 0; % red
0 1 0; % green
0 0 1; % blue
127/255 1 212/255]; % aquamarine
image(M)
set(gcf,'colormap', cmap);
if 1
% make dummy handles, one per object type, for the legend
str = {};
for i=1:size(cmap,1)
dummy_handle(i) = line([0 0.1], [0 0.1]);
set(dummy_handle(i), 'color', cmap(i,:));
set(dummy_handle(i), 'linewidth', 2);
str{i} = num2str(i);
end
legend(dummy_handle, str, -1);
end
if 0
[nrows ncols] = size(M);
img = zeros(nrows, ncols, 3);
for r=1:nrows
for c=1:ncols
q = M(r,c);
img(r,c,q) = 1;
end
end
image(img)
end
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