The value I put in is 0x00000000, the value I get back out Is 0x00ffffff
but the effect ix not limited to fully transparent pixels.  Near!y 
transparent
come back as nearly white.  The "white" pollution continues up through
the transparency scale, so my smooth gray shadows become tinged 
with white, because the partially transparent black has become 
partially transparent white.

You can see this clearly in the attached images.  I suspect this is 
because IOS is using pre-multiplied transparency, so the information
about the original color is actually being lost.   

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