MATLAB: How will be mean brightness of color image will be formulated in matlab

image processingMATLAB

color image is of three channels, so how to calculate mean brightness of the image Do i need to separate each channel of color image and then calculate mean of the brightness say in LAB space i need to calculate mean of only L which represent luminance or brightness of image

Best Answer

If you have an Lab image as a 3D matrix with planes L, a, b, just use
meanbrightness = mean2(Lab(:,:,1))
If you have an RGB image, you can convert it to Lab using
RGB = imread('peppers.png'); 
cform = makecform('srgb2lab'); 
Lab = applycform(RGB, cform);
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