_scale(a, n, m, copy=True)
Numbers can be represented exactly only if m is a multiple of n.
Input image array.
Number of bits currently used to encode the values in a.
Desired number of bits to encode the values in :None:None:`out`.
If True, allocates and returns new array. Otherwise, modifies a in place.
Scale an array of unsigned/positive integers from n to m bits.
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