Then mounted my camera parallel to the floor. I used a softbox on the right side which gave extra sparkle. ISO 320, 1 second @ f/10 with an 85mm fixed lens.
In Photoshop I used an Adjustment layer to turn it to black-and-white and increased contrast.
I opened the sunrise / moon shot from Southport, NC and selected the sky just above the pier with the Rectangle Marquee tool – then Ctrl – Shift – I to invert and Ctrl J to set the water/pier selection on its own layer.
Then I used Shift – Move to drop the starry sky on top of the layer stack. By using Screen mode, the black all dropped out and just left the “stars”. Then I reduced the “stars” opacity a bit for realism.
This is not exactly as Jim explained, but very close… thanks for the inspiration, Jim!