Batch Preprocessing/ImageIntegration- Can you Sum L Images?

[jerryyyyy]

When I used CCSStacker, I could Sum the L files and did a mean of RGB.  Seems like this script only allows mean/median but no summation.  Am I missing something?

[Geoff]

Sum and mean contain the same information.  If you have the mean of n images, then using PixelMath to multiply all pixel values by n will give you the sum.  If you have the sum of n images, then dividing by n with PixelMath gives you the mean.
Geoff

[Juan Conejero]

Seems like this script only allows mean/median but no summation.

Sum and average are equivalent in terms of signal-to-noise ratio improvement, which is what image integration---and imaging, in general---is all about. By summing frames you get higher levels, and you may think that you have more data in this way. But this is just a false impression. The ratio between signal and noise is the same if you divide the sum result by any nonzero number, as the number of frames for example.

[jerryyyyy]

Had my suspicions about the math.  Thanks for the clarification.