How to Make a Scan Line Pattern Fill in GIMP

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In this video tutorial, I show you how to make a scan line pattern fill to reproduce the screen of an analogue television as an effect in a GIMP image editor.
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Intention

Real-world images have lots of noise: film grain, scanner lines, CCD noise, paper texture, and just about anything else you can imagine. Computer-generated images, on the other hand, tend to be too real. If you need to make computer-generated images look like real-world ones, then this tutorial is for you.
Why Would Anyone Want to Ruin Perfectly Good Images?

Perhaps you’ve rendered a gorgeous 3D scene, but want to make it look more like a photograph. Perhaps you’re compositing two different photos, and need make the grain match.