Lightning
Start with a white background of an RGB image. Using
the Gradient Tool (G) to create a black-to-white diagonal gradient.
With black as the foreground colour, click and drag from the
top-left of the image to the bottom right.
Choose Render -> Difference Clouds from the menu.
Improve the colour levels by pressing Ctrl+Shift+L (Auto-Levels).
Invert the image (Ctrl+I). Separate out the bolt of
lightning by going to the Levels dialog (Ctrl+L) and setting the
values similar to the illustration:
At this point you may like to use the Eraser Tool (E) to clean up
any blotches on your lightning bolt.
Use the Hue/Saturation dialog (Ctrl+U) to give
your lightning bolt an electric colour. Use the values from
the illustration below. Make sure 'Colorize' is checked!
Voila! The finished lightening bolt.
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