DLP: SVGA or XGA?

Discussion in 'Archived Threads 2001-2004' started by Stasulos, Sep 19, 2002.

  1. Stasulos

    Stasulos Stunt Coordinator

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    Which DLP projector is better for just watching DVDs (no HDTV): SVGA or XGA?
     
  2. Micheal

    Micheal Screenwriter

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    Usually the higher the resolution the better the image (Even if the source is DVD) but that can vary a bit from projector to projector.
     
  3. Gabriel_Lam

    Gabriel_Lam Screenwriter

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    Another thing to consider besides the screendoor effect is 800x600 is a bit too low to show DVD at full resolution. The minimum resolution required on a fixed pixel machine with square pixels is 854x480.
     
  4. Stasulos

    Stasulos Stunt Coordinator

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    I was thinking in terms of fitting 854x480 into 1024x768 - that would create some distortion. On the other hand fitting 854x480 into 800x600 would create information loss, which is probably worse.
     
  5. Micheal

    Micheal Screenwriter

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    It doesn't create distortion. The more pixels in the image the smaller the gaps and the smoother the image will look.

    Look at a picture on your PC (wallpaper maybe) and change your display settings from 800x600 to 1024x768. You'll see what I mean.
     
  6. Gabriel_Lam

    Gabriel_Lam Screenwriter

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    Yes, you are correct, Stasulos. Depending on your processor, scaling DVD up to XGA will tend to have some interpolation errors and problems. However, this tends to be a small issue compared with the information loss of a 800x600 system.
     
  7. Micheal

    Micheal Screenwriter

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    I must be missing something? Why do people bother with HTPC's? They scale the image of a DVD past XGA and it looks fantastic. I know the software has something to do with it but doesn't the pixel count help not hinder?
     
  8. Gabriel_Lam

    Gabriel_Lam Screenwriter

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    With digital projection, there's always a native resolution. Take for instance XGA (1024x768). You take a native 16:9 DVD signal which is 720x480 (with rectangle pixels) and scale it up. You end up with 1024x576. There will be a row 96 pixels tall on the top and 96 pixels tall on the bottom that are unused.

    All digital projectors have scalers built in. Not all are good though. The new NEC HT1000 has a Faroudja FLI2300 chip which handles the scaling. That's an excellent solution. Most are not nearly as good.

    If you have a projector with a poor scaler, it's best to use a HTPC to handle the scaling, then feed the native signal (XGA in this case) to the projector. By using a high quality scaler (HTPC in this case) and bypassing the poor internal scaler, you'll get a higher quality picture.

    In general, you are correct. A higher pixel count will help, not hinder the picture quality. However, it's the scaler which interpolates the data. Use a poor scaler, and you may actually get a better picture from a 854x480 native projector than a 1024x768 native projector.
     
  9. Micheal

    Micheal Screenwriter

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