When picking a color halfway between 100% white (0xffffffff) and fully
transparent (0x00000000), the result was 50% opaque 50% grey
(0x80808080) when it should really be 50% opaque white (0x80ffffff).
This had a tendency to create grey fringes on things. The fix is to
weight the non-alpha components based on how much they contribute to
the final alpha value.