Keystone correction

Discussion in 'Projectors, Screens & Video Processors' started by livaspy, Jun 15, 2019.

  1. livaspy

    livaspy
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    Hello, its the first post to the avforum and i have a question about an argument with a friend.
    Is the pj keystone correction affect the image quality (resolution)?
    A single user understands the difference of the image?
     
  2. gav_sw20

    gav_sw20
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    Yes it affects the quality as it skews the image.
     
  3. Mark_a

    Mark_a
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    If it was optical it might not, but as they all use digital methods it has to manipulate the screen resolution to bend the picture, so yes it definitely affects the resolution. The better question, surely, is does it affect the picture enough for you to notice, especially say with a 4k picture, where a few missed pixels might not be so much of a problem?
     
  4. Thatsnotmynaim

    Thatsnotmynaim
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    Don’t use it, just align the PJ or use lens shift if you have it. Keystone if done digitally, if not set to zero you instantly loose 1-2-1 pixel mapping, which will reduce picture quality and sharpness and you’re more likely to get moire patterns..
     
  5. GaryB

    GaryB
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    When I was at JVC, I did suggest they they add an on-screen warning, advising that picture quality would be adversely affected when Keystone was activated. It hasn't happened as far as I know.
     
  6. IWC Dopplel

    IWC Dopplel
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    I agree with all of the above and do also make sure your screen is plumb this will help

    Projector Alignment
     
  7. Joe Fernand

    Joe Fernand
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    Ideally you 'pixel map' your Source Output to the native pixel of your display, then ensure no overscan is applied.

    Use a Horizontal and Vertical 1 pixel wide black/white stripe test pattern - the on screen image ought to look uniform grey if you get it set correctly.

    Now tweak keystone and you will see how it affects the image.

    Joe
     

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