Overall intensity calculation from an image

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Mahe Jabeen 2023-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/2024547-overall-intensity-calculation-from-an-image

评论： Image Analyst 2023-9-23

Hi,

I want to calculate the overall intensity of this image here. I have separated this red channel from an RGB flurescence image. Please guide me on how to do this.

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Image Analyst 2023-9-22

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Not sure what you mean by overall intensity. You can get the red channel like this

redChannel = rgbImage(:, :, 1);
% Get sum of all pixel values:
sumOfValues = sum(redChannel(:))
% Get mean value of image intensity over all image pixels
meanIntensity = mean2(redChannel)

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Mahe Jabeen 2023-9-23

Hi @Image Analyst, yes I agree with your point. My values were switched in the code I pasted and was calculating sum of intensity of all the gray pixels, not the sum of pixels.

Image Analyst 2023-9-23

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