imcombine - sigma image with median stack

Adam Stanford wrote on Nov 05, 2008

How is the sigma image calculated when you median combine a stack of
images with imcombine?

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Francisco Valdes wrote on Nov 05, 2008

The sigma image is always the the reduced RMS (root mean square corrected for a finite population by using N-1) of all non-rejected values about the output value at each pixel. So for a median the RMS is about the median value.

Yours,
Frank Valdes

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Last post on Nov 05, 2008