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You could scale points according to the pixels' luminance like so:

f@density = luminance(v@Cd);
p@scale = f@density;

circles_sketch.jpg.7c49a9234dc92dcc438e3e72d15616b0.jpg

1) Colored grid. 2) Circles scaled by luminance. 3) Jittered circles. 

sketch.hipnc

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