I want to take an input factor, such as a mask or pass, and get the average value of the pixels within it. How can this be done?
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Blender has a levels node that return:
- Mean (Average).
- Standard Deviation.
answered Sep 23, 2016 at 9:24
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$\begingroup$ Is it possible to use this with Alpha, or somehow limit it? If I have an image that is mostly black and then has a colored object, I want to get the levels of that colored object. But the levels node does not seem to recognize Alpha, so I always end up with the background color being factored in too, making it useless. $\endgroup$– AscalonCommented Sep 24, 2016 at 9:32
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$\begingroup$ @Drudge I just tested it with alpha, Alpha does not seem to be calculated in the mean. Can you share your setup? $\endgroup$ Commented Sep 24, 2016 at 10:35
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$\begingroup$ Doh, you are correct. I chose a poor image to test it with. Well that's good news at least! $\endgroup$– AscalonCommented Sep 24, 2016 at 11:54