I am trying to use K-means on a grayscale image

Hello all, When I try the following code I get just a white figure as a result. Is there something that I skip or is there a way to fix this? Thank you

I = imread('lena.bmp');
figure(1)
imshow(I);
I = im2double(I);
c = kmeans(I(:),35);
I = reshape(c, size(I));
figure(2);
imshow(I);

Answer 1

[KSSV]

I = uint8(I) ;
imshow(I);

Answer 2

[Adam]

Without being able to run your code (I don't have 'lena.bmp' and can't be bothered to try to find it!), I is going to be of type double, but will contain integer values for the indices of your classes.

imshow, when given an image of type double expects their values to be between 0 and 1 so everything above 1 is saturated as white.

Either cast to an integer, scale down to 0 to 1 or use something like imagesc with a colourmap instead.