"Luke... you must go to the Dagobah-system..."
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Step 1 Ever wanted to create those cool StarWars-ghost sightings? Well, just open up any picture to put the ghost on;

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Step 2 I will use Obi-Wan having a conversation with his old master Qui-Gon, now I need to open a picture of Qui-Gon first;

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Step 3 Then I need to cut the background out of it with a desired tool...

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Step 4 And cut off everything that doesn't fit the image.
You can see it clearly when you lower the opacity;

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Step 5 Ok, now you're done right?;

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Step 6 Now you can either add a Gradient Map or just duplicate (CTRL+J) the layer 2 times and make both blue and set the top-layer to overlay;

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Step 7 Also add a white-blue outer glow;

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Step 8 Now lower the opacity to a decent amount;

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Step 9 And finally, if needed, press CTRL+U to make the image a bit more lighter..
