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In PS, resize the image size times 4 (well, possibly less if the original was larger, say 2) to allow finer control.
Then Control A (to select it), contol C to (to copy it), contol V (to paste it). Now you have 2 layers of the same image. Set the upper layer to "darken" blend mode, then make sure the upper layer is active, and click on the "move" tool. Then click on the image again and use the arrow keypad keys to move the top layer left/right/up/down to make round stars. When smick, click on "layers" tab and merge, to get back to one corrected image. Then make "image size" back down to the original size.
This only works if there is slight egging, too much moving will induce artifacts.
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