Necrosis analysis in H&E tissue slide

Hello All,

I am trying to quantify necrotic regions on my tumor tissue slides stained H&E. Below is my slide captured image:

Is there any way to quantify only necrotic regions?

Thank you,

Have you looked through the other two threads on this subject?

Thank you for your quick response.

I tried to do both threads. I had a better experience with the first one, finding x and y length.
I wonder how I can convert the lengths into the area.

Thank you,

I am a bit confused; where did you see something about length?