Tutorial: Simple Scanlines
Open up a photo, or something else that you want to provide with scanlines. If you just want to test this tutorial download my sample-signature from the right and open it.
Create a new empty layer. Take the Bucket Fill-Tool, choose white as foreground color and then fill the layer with it.
Now apply Filter / Distorts / Erase every other row and just click OK. The lines are divided already, but the effect is not clearly visible. Click the picture to see what i mean.
We’re going to enlarge the layer.
Take the Scale-Tool. Click the layer. In the upcoming dialog choose 200 “Percent” as Value for height and width. Click OK.
Now set the layer mode to “Overlay”.
Done, enjoy the effect ;)