Legacy ImageMagick Discussions Archive

I am looking for a "simple" way to get the standard deviation of an image. I have used this:
However, I am using a Mogrify wrapper, and when I try doing:
I keep getting the same info as if I was doing just
What am I missing?

mogrify is a much simpler and more restrictive function than convert. It does not allow you to include convert or identify within it, nor does it allow % escapes nor most compose operations. I do not know if there is a solution using mogrify alone.