I am pretty new to ImageJ. I need to calculate the amount of porosity in a cross section of some ceramic samples. In a prior job, I used ImageJ to analyze porosity of a coating for biomedical applications. The problem is that I do not remember the steps on how to accomplish this in the software. I believe I need to make the image into grayscale to separate out the pores. Is there a tutorial that anyone knows of for how to do this?