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Have you ever wanted a picture to have a foggy atmosphere, but don't have the money for expensive programs that create them? No problem, all you need is a image editor capable of transparent layers. I'm using The Gimp, but Photoshop, or PhotoPlus5.5 would work just as well.
Next, create a transparent layer and then flood fill it white. Then use the toggle switch to shut off the bottom picture.
Now you need to add some noise. Each program does this in a slightly different way, but the results are pretty much the same. Whatever program you use, set the noise factor to around 40%.
Now is where you have to decide what kind of fog you want. Thick as pea soup or floating around in big puffs. Either way, you achive this effect by blurring the noise. Here is where you will spend most of your time. Every program has a different way of blurring pictures. The Gimp has a great effect called plasma, which breaks the noise up into clumps. However, you must adapt to the programs you have, so it may take some time before you find the effect you like.