how will be mean brightness of color image will be formulated in matlab

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Poonam
Poonam 2015-7-9
回答： Thorsten 2015-7-9
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

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Thorsten
Thorsten 2015-7-9
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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