Making screenshots look photographed
Learn how to make plain screenshots look like they were created with a camera pointed at the screen.
Take a screenshot and open it in the GIMP.
I will be using a screenshot of this site: Download Picture 1.png
Create a new layer above your background layer and fill it will black. Set its opacity to 20%. Now go to Filters > Distorts > Erase Every Other Row:
Now flatten your image (Image > Flatten Image):
Select the Perspective Tool:
Using the Perspective Tool, drag the corners of your layer to make it look something like this:
When you're done, click Transform:
Crop your image so none of the transparent background shows through. Select the Rectangle Select Tool and create a selection over your screenshot. Image > Crop to Selection. Viola, you're done!