Photo editing.
Just play around with the hue (to make it red) and after that with the levels to make the darks darker.
You can also add a faint (lower opacity) gradient with the bottom darker and the top lighter for effect too.
and just a quick tutorial on the triangle, cuz I can:
1. make the triangle
2. copy said triangle
3. make said triangle black
4. (gaussian) blur it a bit
5. lower opacity
6. change the triangle's position equally to the right and below
Here is my 10 minute go at it, using this photo (which is not my photo, I just used it for demonstration purposes): http://gatetoadventures.com/grand-canyon-west-and-the-famous-skywalk/

What I can say now (since I am not a professional photo editor and this was one of my first times using levels) is that you don't want to make stuff too dark. adding highlights in the form of a white low opacity brush is good too.
I used Gimp to make this by the way.

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