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what does a scaler actually do?

Discussion in 'Projectors, Screens & Video Processors' started by alpina, Jul 6, 2005.

  1. alpina

    alpina
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    hi guys,

    read most of the threads here and find myself still unclear in regards to what a scaler actually does.

    they may be popular in the US and UK but here in Australia not many of us have ever heard of them. We simply buy a tv connect it to a std of hd set top box and off we go.

    i don't even know if we sell scalers here. same goes for professionally calibrating plama's - all foreign to us aussies :)

    would love a quick online lesson :)

    regards,

    julie
     
  2. Mark_a

    Mark_a
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    The simple answer is that if you have a display that's a higher native resolution than the stuff you send it, then either the picture will be shrunk on your display, or else it will have to enlarge the image somehow to fill the screen. It can do this electronically with what's called a 'scaler'. Something that adds 'best guess' information to fill in the gaps after it's enlarged the image by scaling upwards. It involves complex maths and is best just accepted as something that makes a smaller image fill the screen.

    It can be made to work the other way if the reverse is true. You may have a higher definition feed than what the display is capable of showing. In which case the scaler now has to throw information away to make it fit (down scaling).

    Modern TVs quite often have scalers built in, but you can buy more sophisticated external scalers (which means better final pictures) that do all the work before it reaches the TV. Thus hopefully leaving the TV free to just pass it onto the screen unmolested.

    Regards

    Mark
     
  3. Welwynnick

    Welwynnick
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