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How to obtain sum of RGB color values of a pixel?

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Anushka
Anushka le 27 Mai 2015
Commenté : John D'Errico le 27 Mai 2015
How to obtain sum of RGB color values of a pixel?
Without using I(:,:,1) ,I(:,:,2),I(:,:,3).
  1 commentaire
Stephen23
Stephen23 le 27 Mai 2015
Modifié(e) : Stephen23 le 27 Mai 2015
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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Titus Edelhofer
Titus Edelhofer le 27 Mai 2015
Hi,
something like
sum(I, 3)
?
Titus
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Titus Edelhofer
Titus Edelhofer le 27 Mai 2015
Hi,
what do you mean b "not properly". Was there an error? Result not as expected (see comment by Stephen on grayscale)?
Titus
John D'Errico
John D'Errico le 27 Mai 2015
Probably the image is uint8, so summing the pixels will overflow. Better might be
sum(double(I),3)

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