How to obtain sum of RGB color values of a pixel?
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How to obtain sum of RGB color values of a pixel?
Without using I(:,:,1) ,I(:,:,2),I(:,:,3).
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It is important to note that the sum of the R, G, and B values is not the same as the grayscale! This is because each of the R, G, and B values contribute unequally to the luminance, so they cannot be simply summed to get the grayscale equivalent of a color pixel. If you want the grayscale value, then the easiest way is to use rgb2gray.
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