I'm not very good with the compositor since I mostly only sculpt. But, I need a way to create masks only for my particles.

Say I have the following scene: enter image description here and all the objects except for the laptop and the tree trunks(there are four) are particles(single particle system), and now I need a mask that gives a black mask for all the particles and white mask for the tree trunks. How do I create this mask for the particles?


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