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

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Anushka
Anushka 2015-5-27
评论： John D'Errico 2015-5-27
How to obtain sum of RGB color values of a pixel?
Without using I(:,:,1) ,I(:,:,2),I(:,:,3).
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Stephen23
Stephen23 2015-5-27
编辑：Stephen23 2015-5-27
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 2015-5-27
Hi,
something like
sum(I, 3)
?
Titus
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Titus Edelhofer
Titus Edelhofer 2015-5-27
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 2015-5-27
Probably the image is uint8, so summing the pixels will overflow. Better might be
sum(double(I),3)

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