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I got this nice rainy photo from the Morgue File.
make a new layer
press the d key to make the foreground/background black and white.
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filter->render->clouds
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filter->render->difference clouds
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command L to bring up levels
move the white slider to the left
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The middle grey slider is your glow. When you are happy with the effect click OK.
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You want the lightning to be white so invert the image using command i
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change the blending mode to screen
add a layer mask by clicking on the rectangle with a circle in the middle
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The lightning will cover the entire image so use the v key to activate the move key and use your mouse to shift the lighting until you are happy with the placement.
Press the d key, if the black color box is not on top, press x and they will exchange it with the white and bring it on top.
You need the paint brush to paint out the unwanted lightning so click the b key, use the left and right [ ] to get the brush to the size you want. The black will remove the unwanted elements. The opacity should be at 100%
If the desired lightning is too bright, paint over it with a lowered opacity. I used the 5 key to make it 50% and then lightened it more close to the clouds to help it blend in.
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