MATLAB: How can i understand the meaning of “colors(rgb_label ~= k) = 0;” code meaning

Question

In this code, nColor =3;

"I" is a 768x1024x3 matrix.

rgb_label is a 768x1024x3 matrix that containt just "1","2","3" values of k means applied of "I" matrix. But i never understand what does

colors(rgb_label ~= k) = 0; code do?

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for k = 1:nColors
    colors = I;
    colors(rgb_label ~= k) = 0;                 %%%meaning???
    segmented_images{k} = colors;
end

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Answer 1

Hi,

Line below returns the logical array for the condition: rgb_label is not equal to k

rgb_label ~= k

Line below takes that same logical array and assigns 0 to those elements of colors for which above condition is true.

colors(rgb_label ~= k) = 0;