4
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Here's the first output:

enter image description here

The second:

enter image description here

And after using Alpha Over node:

enter image description here

Blend file:

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1
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Check the Convert Premul option.

Convert Premul

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  • $\begingroup$ Could you please add some more information, maybe explain what convert premul does? $\endgroup$ – PGmath Oct 26 '15 at 16:10
  • $\begingroup$ @PGmath I actually have asked that question myself. From cegaton's comment there I was able to understand it better, but I don't feel I can explain it well. I hammered out this answer here in a span of a few minutes while on a short train ride, hoping to at least solve OP's problem even if I couldn't elaborate. Feel free to add something to the answer if you like. $\endgroup$ – Mentalist Oct 29 '15 at 3:10

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