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I have an image and I need to reshape it as a 3D matrix. Does any function exist to do it? I need to have a 3d matrix by rows-by-columns-by channels to obtain 3 differents components thanks to the differents channels

I have an image and I need to reshape it as a 3D matrix. Does any function exist to do it? I need to have a 3d matrix by rows-by-columns-by channels to obtain 3 differents components thanks to the differents channels