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Difference between revisions of "What to do when the projected image doesn't fill the screen - troubleshooting"

(Created page with "It is possible that the projected image does not completely fill the screen. There can be several reasons for this: the computer resolution and the projector resolution do not...")
 
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It is possible that the projected image does not completely fill the screen. There can be several reasons for this: the computer resolution and the projector resolution do not match, the powerpoint resolution and the projector resolution do not match, neither computer resolution nor powerpoint resolution match the projector resolution. Note that it is not possible to change the projector's resolution (without installing a new projector and a new screen, both of which are time intensive processes). So the easiest solutions will involve changing the computer or powerpoint resolution.
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It is possible that the projected image does not completely fill the screen. There can be several reasons for this: the computer resolution and the projector resolution do not match, the powerpoint resolution and the projector resolution do not match, neither computer resolution nor powerpoint resolution match the projector resolution. Note that it is not possible to change the projector's resolution (without installing a new projector and a new screen, both of which are expensive and time intensive processes). So the easiest solutions will involve changing the computer or powerpoint resolution.
  
 
The steps below will help technical staff determine the cause and recommend a solution.
 
The steps below will help technical staff determine the cause and recommend a solution.
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# Note down: Was the professor using VGA or HDMI?
 
# Note down: Was the professor using VGA or HDMI?
 
# Ensure that the projector is fully zoomed out. (you need the remote for this)
 
# Ensure that the projector is fully zoomed out. (you need the remote for this)

Revision as of 13:27, 10 August 2015

It is possible that the projected image does not completely fill the screen. There can be several reasons for this: the computer resolution and the projector resolution do not match, the powerpoint resolution and the projector resolution do not match, neither computer resolution nor powerpoint resolution match the projector resolution. Note that it is not possible to change the projector's resolution (without installing a new projector and a new screen, both of which are expensive and time intensive processes). So the easiest solutions will involve changing the computer or powerpoint resolution.

The steps below will help technical staff determine the cause and recommend a solution.

  1. Note down: Was the professor using VGA or HDMI?
  2. Ensure that the projector is fully zoomed out. (you need the remote for this)
  3. Note the size of the projector's blue (test) image that appears when it first turns on. See photo. This is the maximum image size the projector can produce when zoomed out.
  4. Keep in mind the following:
    1. On a 4x3 screen with computer set for a 4x3 resolution:
      1. If you are projecting a 4x3 resolution, it should match both the height and width of the projector's test image.
      2. If you are projecting a 4x3 resolution and open a 4x3 powerpoint presentation in full screen, the projected image will have the same width and height as the projector's test image.
      3. If you are projecting a 4x3 resolution but open a 16x9 powerpoint presentation in full screen, the projected image will have the same width as the projector's test image but not the full height. It cannot fill the full height because the projector's chip is designed for a 4x3 image and it is receiving a 16x9 image from PowerPoint.
        1. Solution: Change the presentation's page setup (File > Page Setup > Slides sized for) to a 4x3 format. This may stretch some pictures in the presentation. There is no automated easy way around that. If you need to show a presentation that is in 16x9 format, use a classroom that has a 16x9 screen.
    1. On a 4x3 with computer set for a 16x9 resolution
      1. If you are projecting a 16x9 resolution, the projected image should have the same width as the projector's blue test image. It cannot fill the full height because the projector's chip is designed for a 4x3 image.
      2. If you are projecting a 16x9 resolution but open a 16x9 powerpoint presentation in full screen, it will fill the width but not the height. It cannot fill the full height because the projector's chip is designed for a 4x3 image and it is receiving a 16x9 image from PowerPoint and from the computer.
      3. If you are projecting a 16x9 resolution but open up a 4x3 powerpoint it will fill neither the height nor the width. It cannot fill the full projected image because the projector's chip is designed for a 4x3 image and it is receiving a 16x9 image from your computer.

Photos:

Projector test image
4x3 screen with 16x9 resolution
4x3 screen with 16x9 resolution and 16x9 powerpoint
4x3 screen with 16x9 resolution and 4x3 powerpoint
4x3 screen with 4x3 resolution
4x3 screen with 4x3 resolution and 4x3 powerpoint
4x3 screen with 4x3 resolution and 16x9 powerpoint
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