I've found this cool tutorial about how to make the same light saber effect as in Star Wars. It only requires a few steps of Photoshop or After Effects and I think the effect is quite convincing.

The picture in the thumbnail is actually one of our wedding pictures, where I am actually holding a fan, but everyone told me it would look awesome if I was holding a katana instead. I found it even more funny to hold a lightsaber in a traditional Japanese shrine instead, although it may look a bit dorky :).

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