Measure the perimeter of white parts in thresholded image

Hello there,
I am doing bone structure analysis with ImageJ.
When I do the threshold and measure (limited to threshold) I get the correct area (and other important parameters) but the perimeter measured is the perimeter of the ROI. How can I measure the perimeter of the white (bone structure).
As always thank you for your knowledge.

Hi @Diego_Hens,

Could you provide an example image to help us.


I was writing the reply but I have come to the solution myself when trying to explain it :joy:
I have to create a selection and then only the white is marked and measured.
I am sorry I posted this too early.
Thank you either way :smiley:

Edit: I have to substract the measurement of the window and then the measurement is correct.