can any one tell me how to extract only the l component of the image ..if the image is rgb ..i want only the l component of the image ,how is it possible

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ashok
ashok on 10 Feb 2014
Edited: Dishant Arora on 10 Feb 2014
can any one tell me how to extract only the l component of the image ..if the image is rgb ..i want only the l component of the image ,how is it possible

Answers (2)

Dishant Arora
Dishant Arora on 10 Feb 2014
R=YourImage(:,:,1);
G=YourImage(:,:,2);
B=YourImage(:,:,3);
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Dishant Arora
Dishant Arora on 10 Feb 2014
you need intensity component?? To get the intensity notion you can take mean of the three components as it happens in HSI model:
I=1/3*(R+G+B);
also you can follow YCbCr model to get intensity:
Y = 0.2126*R + 0.7152*G + 0.0722*B
where Y denotes luminosity.

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Thomas
Thomas on 10 Feb 2014
Lets say you have a three channel RGB image, im.
% extract the red channel
red = im(:,:,1);
% extract the green channel
green = im(:,:,2);
% extract the blue channel
blue = im(:,:,3);
Simples!

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