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Noise level overall profile, channel components

Posted: Sun Dec 14, 2008 7:21 pm
by oyunhand066
What is the difference between noise level overall profile and channel components in profile viewer, when picture is black and white.
Overall profile = 3.54
Channel components (Y channel) = 3.11

For me these two value has to be equal.
Please if someone know why is like that and what exactly these two values present, tell me.