Python: Direct support for 'half' using numpy.float16 type #2694
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When transferring blocks of pixels (for example, by ImageInput.read_image
or ImageOutput.write_image), "half" pixels ended up mangled into uint16,
the only type of the right bit width.
But NumPy has a numpy.float16 type! A little bit of extra hinting to
pybind11 makes this work as users probably expect.
Fixes #2689
Signed-off-by: Larry Gritz lg@larrygritz.com