Derive a colour palette from an image
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I have a question which asks to set the number of rows and columns (M and N) for the painting grid and resize an image to this required gridsize.
I used imresize like below, where B is my image.
B = imresize(B,[20,20]);
It then says use this command to derive the 8 colour palette.
[~, Palette] = kmeans(reshape(B(:),M*N,3),8,'E','s','S','U');
If i replace M and N with my grid values which are 20 and 20 i get this error, for the line above.
Error using .*
Integers can only be combined with integers of the same class, or scalar doubles.
Error in unifrnd (line 34)
r = mu + sig .* (2*rand(sizeOut)-1);
Error in kmeans (line 248)
C = unifrnd(Xmins(ones(k,1),:), Xmaxs(ones(k,1),:));
Am i going about this the right way, and if so what is the meaning of the error message?
Thanks
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