Maya 2012 writes these kind of tiff files. There is an alpha channel,
but no ExtraSamples tag. Tracing the code, I believe adding a line such as
(II, 2, 1, 1, (8,8,8,8), ()): ("RGBA", "RGBa"),
to the OPEN_INFO dictionary in TiffImagePlugin.py would fix this. I'm
only guessing at the "1" default value for ExtraSamples because that's
what Maya used to add in older versions.
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