Consider the setting and purpose for which you will be using your projector. For office presentations, the projector can simply be set up on a table without too much shadow interference. In a museum exhibit, theatrical or party environment, a ceiling projector setup is more practical, keeping the projector from getting in the way of guests.
Decide where your backdrop will be projected. If you don't have access to a screen and high quality isn't a concern, a blank wall or whiteboard will work. If the image quality of your backdrop is important, it may be worthwhile to invest in renting or buying a projection screen. Screens vary greatly in price and quality, from standard roll-down front projection screens to perforated screens that accommodate localized sound effects. It is important to research both the type and size you will need for your project to avoid spending more money than necessary.
If you are setting up your own projector and screen, make sure to read the instruction manual for the appropriate distance you will need between them, since each model is slightly different. Once your projector is installed correctly, if your projector is digital, set up your computer and connect the external display port on the computer to the projector. There are different types of video connection types, including component, VGA, DVI, HDMI and S-video that require specific cables, so make sure you have the appropriate cables and adapters for your equipment.
Connect your computer to the projector and turn it on. You may need to tweak the image in two ways. Slowly and carefully adjust the projector lens until it is in focus. Next, you will need to adjust the display resolution on your computer to match that of the projector. This will be in your computer's "Display Settings" section. For example, in Windows Vista this is in "Control Panel" > "Personalization," and in Mac OSX it is in "System Preferences." If you are unsure which resolution to use, start at the common 800x600 pixels and adjust from there.
Make sure your computer is set so the display will not go into power-save mode and turn off or go to a screen saver and interrupt your presentation. Open your backdrop images or video, and set the program to "full screen" mode so that you will only see your graphics on the screen, hiding distracting computer windows. Your projection backdrop is now set up, and you are ready to impress your audience with your effects!