I got a very simple question here.

How do you render out an image in the background? I’ve been searching and SEARCHING but I can’t find it!!!

can somebody please help?

I would recommend just rendering your scene as usual and then compositing your objects over an image using the AlphaOver node (remember to check Premultiply if you have a strange outline around your objects). Also make sure you enable the compositor in the render settings.

Let me know if you need more detail.

EDIT: You can also just add a plane object from your camera view and scale it so that it fits the view port ~perfectly. Then just add your background image to the plane as a UV texture and render the plane as “Shadeless.”

can u please be a little more detailed? Im kind of lost haha

First, make sure you have composite checked under the render panel, subsection “Post Processing.”

If you want to place a 3D object over a background image, just set up the composite nodes as shown below. You do it all with an alpha over node (shift A -> color -> alpha over). You connect the background image to the first image input socket because that socket is your “starting” image. The second image socket is to have the image to be overlaid, so you connect the render layer to this socket. Then connect the alpha from your render layer to the factor socket of the alpha over node. The factor socket can accept a single value or a array of values (an image). In this way it can work on a pixel-by-pixel basis.

Take a look at your alpha channel for your render layer by connecting a viewer node to it. Any areas that have white pixels have will affect the alpha over node by 100%. Any black areas will have 0% effect (you can guess for gray pixels). This is the way the factor socket works on all nodes.

For more info, see the compositing section of the Blender wiki : http://wiki.blender.org/index.php/Doc:Manual/Composite_Nodes
Blender Manual: http://wiki.blender.org/index.php/Doc:Manual

This will give you a good introduction. Some of it’s a bit out dated, but still very relevant. Also check these tutorials: http://blenderunderground.com/2008/03/31/introduction-to-composite-nodes-part-1/
http://blenderunderground.com/2008/04/10/introduction-to-composite-nodes-part-2/

More in-depth video tutorials here (not for 2.5, but useful): http://www.vimeo.com/user463660/videos

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Or just give the world a texture? Overly complex, much?