I was looking into a similar thing somewhat recently and think (although not positive in this exact case) that the images you see in the draggable “particles downsampled” are lowpass filtered and perhaps grayscale adjusted. You can take a look at some previous discussions about that here and here. The png you show doesn’t look that different to me from the “Original particles” – any individual image will have very low signal-to-noise (hence why we have to average so many to get a reconstruction). I’d give filtering a try with @rwaldo 's script in the linked post and see if that helps you out.
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