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Anonymous
1) Take 10, 20, 30 photos of your scene without moving your camera. Subject must be similarly stationary. Point is, you need a bunch of identical photos, and the more the better.
2) Put all the photos into a Photoshop document as a series of layers. Let's say we have 8 images, henceforth numbered 0-7.
3) Set the opacity of layers 7, 5, 3, 1 to 50%.
4) Merge the layers down in pairs. Merge 7 to 6, 5 to 4, 3 to 2, 1 to 0. You should have 4 layers now, 6, 4, 2, 0.
5) Set layers 6 and 2 to 50% opacity, merge down in pairs. 6 to 4, 2 to 0. Set layer 4 to 50%, merge to 0.
It's called image stacking, and you can also use it to combine a bunch of underexposed images into one perfectly exposed image.
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