Step One

• Pick a B/W image with sharp black lines
• Increase the image colors to 16 million

Step Two

• Go to Image/Edge Filters
• Apply Find Edges

Step Three

• Go to Colors
• Apply Negative Image

Step Four

• Choose the Magic Wand from the Tool Bar
• Select any part of the image
  between the black lines

Step Five

• Go to Image/Plugin Filters/BladePro
• Use the pewter preset by Cheroke
  (increase the height too 100)
• You now have Lead Edges