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Feb 15, 2017 at 6:36 comment added 3pointedit To perform a visual inspection load both into compositor then perform an Image Mix/subtract function. You should see the difference as a result.
Jun 10, 2014 at 21:42 vote accept Justin
Jun 6, 2014 at 19:54 comment added gandalf3 @Justin I think I've read that thread.. I even used it here. Actually, that link is pretty relevant to this question.
Jun 6, 2014 at 19:41 comment added Justin I came across this forum thread on measuring noise in Cycles. It wouldn't quite work in this situation since it compares multiple samples from the same render, but it's pretty cool and might end up in Cycles some day.
Nov 14, 2013 at 3:10 comment added gandalf3 I've been doing some experiments, but I'm not sure that there is a difference in noise.. it's pretty subtle (I've just been eyeballing it though, so not very scientific)
Nov 12, 2013 at 20:17 comment added gandalf3 @Justin See stackoverflow.com/q/8960462/2730823
Nov 12, 2013 at 20:13 comment added Justin @WChargin Any ideas on how to measure noise? If we could do that, finding the sample equivalence would be easy.
Nov 7, 2013 at 5:58 comment added wchargin Yes, sure, but I think OP's point is to consider that five 150-sample images are of lower quality than one 750-sample image - that is, what is the sample equivalence of five 150-sample images? Once you know that, the math is easy, as you've outlined.
Nov 7, 2013 at 3:31 history edited gandalf3 CC BY-SA 3.0
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Nov 6, 2013 at 23:17 history edited gandalf3 CC BY-SA 3.0
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Nov 6, 2013 at 23:09 history answered gandalf3 CC BY-SA 3.0