I found it it is in the stsci package. On Jan 24, 11:36 am, Eelco <hoogendoorn.ee... at gmail.com> wrote: > Either way, if I understand correctly, what you are trying to do could > be done with numpy.median(imagestack, axis=stackaxis), no? Yes, I guess so. I didn't realize numpy.median had an axis option. Thanks. That's one less import.