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The ghostly quality of the particle drawing is really nice. I love how it gets the overlaid effect across but in a nicer way than simple transparency.

How are the particles attracted to the areas of the image that need to be darker?

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They are unaware of the underlying image they draw. Each particle is associated a random picture to draw at birth and continous to draw until death. Draw means copy a pixel from the source image to the displayed output image.

Each particle class is defined with a color in the debug.jpg image

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