How to obtain sum of RGB color values of a pixel?
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Anushka
am 27 Mai 2015
Kommentiert: John D'Errico
am 27 Mai 2015
How to obtain sum of RGB color values of a pixel?
Without using I(:,:,1) ,I(:,:,2),I(:,:,3).
1 Kommentar
Stephen23
am 27 Mai 2015
Bearbeitet: Stephen23
am 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
am 27 Mai 2015
Hi,
something like
sum(I, 3)
?
Titus
3 Kommentare
Titus Edelhofer
am 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
am 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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