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Thread: Projection using mirror causes reverse image (Please HELP)

  1. #1 Projection using mirror causes reverse image (Please HELP) 
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    I have a very tiny office. I have my computer set up with dual monitors,
    one being a projector.

    My situation was that I can not display a large enough projection on my wall because of how small my room is.

    So what I did, was shoot the projector onto a mirror on wall [a] and the mirror reflects that projection to wall [b]. Result is, the larger the path, the wider the image.

    The problem now is, my image is now backwords.

    Any ideas how to reverse the reflection, so that text reads correctly?
    Currently, using my mouse cursor ... left goes right, and right goes left.


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  3. #2  
    Veracity Vigilante inow's Avatar
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    The image isn't technically "reversed" by the mirror. It's just that our brains have a hard time making sense of the phenomenon where the light reflects straight back. Left is still left, and right is still right, but we struggle intuitively trying to make sense of it when its coming from the reflection... there's nothing being reversed.

    Either way, if you put a second mirror in the mix, that should correct it. Reflect off of one mirror, then on to another, and only then on to your screen.


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  4. #3  
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    Most projectors have the reverse and inverse features built into the set-up menu. Have a look at the set-up menu
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  5. #4  
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    use two mirrors
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  6. #5  
    Forum Ph.D. Leszek Luchowski's Avatar
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    Using another mirror or switching the projector to swap left and right are both good ideas.

    Here is another one that might work, depending on the size of your room and your mirror:

    Put your audience near the projector and make them look into the mirror. They will see a reflection of the screen, with the text correctly oriented.

    Good luck, and keep us posted.
    Leszek. Pronounced [LEH-sheck]. The wondering Slav.
    History teaches us that we don't learn from history.
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  7. #6  
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    The easiest way to use two mirrors would be to have a small (high quality) one as close to the projector as possible mounte at 45 deg thus effectively becoming part of your system as it is. THis will mean everything stays as you have it and only a tiny extra space is involved.
    "You are only intelligent IF you are surrounded by fools, so don't mock them..." [HOME200]
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