Hash an image already held in memory. Avoids the temp-file round-trip that mhImageHash(String) requires. The byte[] is the row-major interleaved pixel data; for a 3-channel RGB image it should be width*height*3 bytes, for a 4-channel RGBA image width*height*4 (alpha is discarded), and for a 1-channel grayscale image width*height.
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