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what is a scaler?

Discussion in 'Desktop & Laptop Computers Forum' started by taimur, Feb 16, 2003.

  1. taimur

    taimur
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    Can someone tell me what a scaler is?

    Thanks
    Taimur
     
  2. Jeff

    Jeff
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    In very simple terms it takes regular usually interlaced video or film material and upscales it to a higher usually progessive resolution. My my case I take 720x480i (R1 DVDs) and scale them up to 1440x960p. While upscalling doesn't add any real detail it does make the picture look much better especially on a CRT projector. With digital projectors there is much to gain by scalling to its native resolution.
     
  3. taimur

    taimur
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    thanks - so am I right in thinking that a PC DVD drive reads the information in the DVD as its been encoded (whatever that may be) and scles it to the output of the VGA card and this is one of the benefits of a HCPC system over a DVD drive?
     
  4. JohnS

    JohnS
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    Nearly, the VGA card is the bit that does the scaling and by the scaling occuring in the PC all the display device has to do is display.
     
  5. taimur

    taimur
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    I see... thanks
     
  6. BadAss

    BadAss
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    Does this mean a PC DVD drive outputs a standard resolution of 720x480i?
     
  7. Kramer

    Kramer
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    No.

    A PC DVD drive outputs only a digital data stream. Bytes - 1s & 0s.

    The DVD player software (or any other pertinent software) takes this data & decodes/utilises it accordingly.

    But the data stream has "tags" or "flags" which tell the software whatever format is on the DVD.

    I think I'm right there, but, as always, explaining is my problem :blush:
     

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