If there is more than one hook-up on the back of the projector (I haven’t seen one that doesn’t have multiples) then once hooked in you’ll have to manually select the projector’s input so it knows where to look for your incoming video on which channel. You select this via the projector’s remote
or sometimes it’s on the actual unit too. All projectors are different so you may need to look up the model’s manual online if you are stuck on how to change which input the projector is reading. It’s similar to a home TV though so it’s fairly intuitive. So let’s say you have and HDMI cable hooked from a laptop to your projector. just select HDMI on the projector and you should be getting an image. One added thing is, some projectors have auto-connect where it detects a video signal coming into one of its inputs (say VGA) it will then automatically select that input channel for your video feed, nice feature when it works.
On the projector setting resolution is also an important setting. It will set the default resolution to whatever the native resolution is for the port you are using. For example if you are using VGA it will set
the projector to 600 x 800, which is VGA’s native and max resolution. you can’t really raise it as the cable you are using is designed only to handle up to a certain resolution. You can lower the resolution
either on your computer or the projector but you can’t raise it past the capabilities of the cable you are using.
Throw distance is something you have to think about when using a projector. The further set back
from the screen a projector is the larger the image or projection will be. Conversely the closer the projector is to the screen the smaller the image or projection. There’s a feature in some projectors called short throw. this is where even when a projector is relatively close to the screen it does a good job of spreading or throwing the image wide to cover a surface or screen while keeping the projector close like say downstage.
You also have minor adjustment features on the projector like zoom, keystoning, focus and lense shifting. These are helpful to fine tune your image once it is being projected on-screen.
First and foremost you should focus your image if the projector has that capability.
Focus is often on the proctor on the physical ring surrounding the lens. Adjust this
lens left or right to get the image clear and in focus.
Zoom, there is digital zoom and optical, if you have a cell phone that takes pictures you realized that digital zoom degrades or pixilates the image is ideal as it doesn’t degrade the image when used.
Zoom is used to get the image big enough or small enough to fit on the screen