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So now I'd to give you a little extra tidbit, getting you started with adding 3D backgrounds, even multiple 3D backgrounds. So to do this, you start out in the Themes menu. So we'll go down here to click on Customize Current Theme. And in this case, we want to stay in the advanced tab of this Theme panel. We can click on Edit a 3D Background here. And then from here, you can add a single 3D background image. And this allows you to place elements on top of the image and then zoom in and out of it, giving the feeling of three dimensions, as you saw in our sample template Prezi.
The recommended resolution for a 3D background is 2000 by 2000 pixels. If your image isn't square, I found that adding white space around your image and saving it at exactly 2000 by 2000, gives me the crispest image when I zoom in. You can use a JPEG, PNG, or a GIF image here, but I found JPEG images to be the best for these large background pictures. Now if you want to get tricky, you can add up to three backgrounds. And as you zoom in closer, you'll move through one to reveal the next. And to do this, you just click on Upload, and it will prompt you to upload another image.
So we'll go, switch over to fresh water shortage. It's this Prezi by Drew Banks that uses this in a really cool way. You can see he starts zoomed in. And zooms out to reveal another background. And it really creates a dramatic transition. A dramatic field to, in the presentation. Now I should tell you that these tansitions can be a little bit tricky from one 3D background to another. Like most things in Prezi, it's not exact. There's some math under there. There's some calculation that says, you know, change from one to the next.
But that's not really revealed to you. You really have to do it by trial and error to get those transitions just right. But when you nail it, just like in this example, it's really beautiful.
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