User is reporting the Post Process is rendering a grainy background in 4.8 compared to a solid Black background in 4.7.6.
in 4.7.6
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in 4.8.0
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RESULTS: The Black in Level is actually a grainy mix of very dark greys
EXPECTED: The Black should be in pure black (as in 4.7.6)
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-17128 in the post.