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Grey Screens and Black Levels

Discussion in 'Projectors, Screens & Video Processors' started by LV426, Feb 9, 2001.

  1. LV426

    LV426
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    This is just a thought........a number of posts in here talk about using grey screens instead of white, to improve the black levels on LCD projectors. Nice idea. But, has anyone considered that the same effect might be obtained by wearing medium density sunglasses whilst watching? It's certainly less messy than painting!

    On another forum dedicated to certain projectors, other users have suggested getting a neutral filter of a suitable density (ie a grey filter). These are obtainable from photo stores (eg Jessops) and are primarily for use with cameras, but, provided you can get one the right diameter, will work equally well fixed to your projector lens.

    Either of these alternatives will achieve exactly the same result as a grey screen, with one major difference: they are easily reversible.

    [This message has been edited by nigel (edited 09-02-2001).]
     
  2. Jagular

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    If the problem on LCD projectors is too much light seeping through the matrix on dark; how about reducing the light intensity by stopping it down on the lens (as the ‘f’ stop does on a camera). A simple and effective way would be to put a cap over the lens and experiment with the hole diameter. (If you try this please make sure it's something the heat won't melt, or at worst cause a fire! I wouldn’t like to be held responsible for that!)
    If it works, surely it must be far cheaper and give an even sharper image than using a ‘grey’ screen.
    Just a thought!

    Rob.
     
  3. Mr.D

    Mr.D
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    A bit of neutral density filter gel would be a better bet to knock back the stop.

    I'll do a bit of research. I'm wondering if there is a filter out there that knocks down the lower end of the intesity scale but leaves higher intensities intact. A bit like an in built gamma.

     

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