ut for this case can also be hxwx1 (normalization only).

 If colorSpace=='hsv' transforms I to the HSV color space. The output is
 within numerical error of Matlab's rgb2hsv, except ~15x faster.

 If colorSpace=='rgb' or colorSpace='orig' only normalizes I to be in the
 range [0,1]. In this case both the input and output may have an arbitrary
 number of channels (that is I may be [hxwxd] for any d).

 If colorSpace=='luv' transforms I to the LUV color space. The LUV color
 space is &quot;perceptu