I take no credit for this, all credit goes to: Scan Lines - Photoshop Tutorials - thedesignworld.com
here it goes:
1. New File
Create a new file,make it 1 by 2 pixels and with a transparent background.
2. Zoom
Zoom in all the way to 1600%
3. Pencil
Now select the pencil tool and select the bottom pixel
4. Save Pattern
Now go to Edit>Define Pattern,add the name you will remember it as then select ok.
Adding Scan Lines to image
Open the image you want to add the Scan Lines to,then make a new layer and Edit>Fill then where it says use,select Pattern and under Custom Pattern find your image then press ok.
After
You should drop the opacity and fill depending on your image.
Done
Now your done,It should look something like this if you did it right
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