am trying to create a brochure in Photoshop. But how do you get such a folded effect i.e. when I want to show the brochure to someone else as a preview, I want to make it look as if it's folded (like in the image below):
You can easily get that by using a mock up. Just download it and place your picture in the layer which they mentioned.
what Rijin mentioned is actually correct.
Normally for designers first we design the draft, & then we would actually find some nice mockup template to show the client so that they can visualize how are the actual print outs going to look like as a preview. This is quite common in our company here so that we can save time & avoid misunderstanding on both sides.
For me i personally use http://graphicburger.com/ for mockup resources. Download the mockup which you find suitable & replace the content by double clicking on the smart object layer.
I hope this helps. :)
I have also resorted to using premade mockup PSD files to show clients, because I don't want to spend the time creating my own. (even though the sample mockup doesn't show the 6th panel).
If you grab a mockup from someplace, you'll notice that there are one or more layers with "editable" content (clicking on the layers will open an embedded photoshop file, sometimes nested 2 levels down, where you replace their artwork with your own)
Those layers on the mockup file are treated with layer effects, shading, and distortion to yield a realistic look.
all the above answers are applicable. but none of them mentioned "photoshop action" .. simply you can download a free photoshop action from tons of it online ... simply you can select the way your folded brochure would look like and place your design over a template then run the action and that's it.
if those link are dead in the future, you can google "folding brochure Photoshop action" if not you may use a preset action or just do your own action.
and what is a photoshop action? it is a list of commands and transformation values you can do by yourself as if you are doing the folding brochure from scratch, a step by step. like dividing your design in three layers and preposition and rotate every layer to take the effect of a real folding brochure, and by adding some shadow and light effects.