1. Open Photoshop. Open an image to apply line effect. 2. Desaturate the image by Image > Adjustments > Desaturate3. Create New file with 1 pixel width, 2 pixel height and transparent background.4. Keep Black as a foreground color. Fill the top 1 X 1 pixel of transparent background using Pencil Tool.5. Select All using CTRL + A6. Create a pattern by Edit > Define Pattern. Name the pattern.7. Close the Pattern file and go back to image file.8. Edit > Fill(Choose "Pattern" from "Use" drop down menu and again in "Custom Pattern" you will find newly created pattern)9. Select newly created pattern and fill the image.
