Open a photography, the effect will be extra cool if you have for example a blue sky or something like that.
This is the photo I choosed to use in this tutorial:
In the layer-window down-right, you will find a button that looks like a circle which is half black and half white. Click on it and click on 'Channel Mixer...'
A new windows will popup, click once in the box for Monochrome to mark it, click on OK.
A new layer will now appear. Change the blend mode of the new layer to 'Lighten'.
You are now done, here's my final result:
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