I want to use ImageJ for counting my different tephra populations in a thin section sample, but I am not able to separate the lighter populations from the darker ones in ImageJ before counting. I have tried the plugin Color pixel counter with no success and I have also tried to separate using the Color threshold with no result either. Does someone have an idea?

I attach an example of a picture of one of the samples I am studying to make it easier to understand.

Thank you in advance

Antonio Polo Sánchez

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