image - how to find low element from 3 dimension array -

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when read color image information data in rows x cols x 3(rgb color)

i want extract min value separate color

originally 

r = i(:,:,1); g = i(:,:,2); b = i(:,:,3);

to extract separate data color , find min by

rmin = min(r(:));

and on...

but there proper solution use min?

i tried 

min(i(:,:,1:3));

but didn't right (dimension answer 1xcolx3 : should 1x3)

my guess have use nested min. example use following command

min(min(i, [], 1), [], 2)

this should give result want.


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