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please explain the output of this matlab code

When I run the code below for the attached image, I was expecting a single value for a max but got a load of values I dont understand?

Can someone please explain this for me
I=imread('C:\Users\Justin\Documents\MATLAB\lab2\lightbulb', 'jpg');
    d=max(I)

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lightbulb.jpg
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jtiernan2008
Asked:
jtiernan2008
1 Solution
 
yuk99Commented:
No, the function calculate maximum value for each vector in the 1st dimension, means across rows. So if array I is MxNx3 you should get 1xNx3 result after MAX function. To find maximum value for the whole array do max(I(:)).
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