Hvordan fungerer "overscan" funksjonen på PJ`en

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  1. #1
    Newcomer Jsound sin avatar
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    Hvordan fungerer "overscan" funksjonen på PJ`en

    kanskje litt dumt spørsmål, men jaja :lol:

    Har en infocus sp4805 og der kan jeg sette på "overscan". Hva er det som skjer med bildet når jeg bruker det? Kan ikke se noe forskjell på bilde kvaliteten, men det skifter fasong (må stille keystone på nytt). Jeg har en Pioneer dv-575 dvdspiller.

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    Expert Niels Nielsen sin avatar
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    Ikke sikkert du trenger bruke den, men overscan er å gjøre bildet litt større så ytterkanten av bildet havner på den sorte rammen rundt bildet.
    Har du DVE platen er der et testbilde derpå med overscan.
    Vitsen er å la "artifakter" i ytterkanten av bildet havne på rammen så de ikke kan ses..Men, jeg er ikke helt klar over hvordan det funker med digitale projektorer, jeg har crt.
    Mener det er sånn da...., jeg har ca. 3 cm overscan på rammen min.

  3. #3
    Newcomer Jsound sin avatar
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    har ikke DVE platen, men skal skaffe meg en sånn.. takk for svar:P

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    Administrator Ak sin avatar
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    Kopiert fra Hometheaterhifi.com

    Overscan: A thief

    Ever notice how the image on your TV goes right to the very edges? Do you really think that your set is so precise as to fit the picture perfectly to its glass? The answer is of course no. All televisions have what we call "overscan". Portions of the actual picture area fall outside of the physical viewable area of our TVs, sort of like a photograph that has the matting covering the rough edges of the picture. How much of the picture that gets lost to overscan varies from one set to the next, but it's safe to say that about 5% of the picture area is missing from each edge with some sets cutting off as much as 15% on one edge or another. Before you panic about missing some really important detail on "Seinfeld" tonight, take heart in the fact the program creators are aware of the situation and are careful not to put something critical too close to the edge of the picture. They have what is called a "safe title zone", somewhat in from the edges where it is considered safe to put, say, a title (duh!) They also have a safe action zone closer to the edge within which it is considered safe to put action that you really need to see. This does not mean we should all be happy with this state of affairs. We are losing, wasting if you will, real picture detail at the edges. So, instead of physically seeing 720 pieces of the picture along each horizontal line, I might only be seeing 620 - 650 (assuming all other hardware can display that resolution). So why overscan? Simply stated, it's our own fault. Consumers hate seeing any fraction of an inch of their picture tube going to waste. They want the image to fill the screen (never mind the fact that you end up missing part of the picture). The funny thing is, in the computer world, we don’t mind a small black border around our windows desktop at all. Go on, have a look right now. If you’ve ever played with the sizing controls on your monitor, go ahead and stretch the picture vertically until your Windows “Start” button disappears below the bottom of the screen. Now do the same in the horizontal. How would you feel about working Windows like that all day? You can’t even see your task bar (or menu bar for the Mac users). If you’ve managed to make either disappear off screen, you’ve now overscanned your monitor. Got an idea what you might be missing on your TV?
    Dette gjelder ikke din projektor, men det står litt om hva Overscan er.

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