Intensity in ImageJ

I have a following analysis that I am trying to do. I am attaching a picture of a slice of a tomogram representing bacteria. You can see a smaller forespore being engulfed by a larger mother cell. PG stands for peptidoglycan. There is a thick PG on the outside of bacteria and a thin layer of PG between forespore and mother cell membranes as labelled. What I am interested in is getting the intensity of thin layer of PG between the membranes throughout the membrane and normalize it to outer layer of PG.

Plot profile, maybe? But your image is mostly very dark and very bright small regions. I guess that you do not have a proper difference in intensities, but more like a halftone textures of dark and bright dots.

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