Line doubled 480p and HDTV/monitor stretching

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  • #26524
    2mg
    Participant

    Need a quick technical clarification:

    Since most modern digital displays do support 480p mode, won’t they “re-scale” that resolution mode anyway to fit the screen (either by aspect ratio with black borders OR full screen stretch)?

    If so, doesn’t that add as much lag as it would with 240p upscaling if supported by the display?

    #26538
    BuckoA51
    Keymaster

    Since most modern digital displays do support 480p mode, won’t they “re-scale” that resolution mode anyway to fit the screen (either by aspect ratio with black borders OR full screen stretch)?

    A modern display will re-scale anything other than a signal sent at its native resolution.

    If so, doesn’t that add as much lag as it would with 240p upscaling if supported by the display?

    No, scaling adds relatively little lag (usually none). It’s picture processing and especially deinterlacing that adds the most lag. Especially in the case of 240p which is nearly always recognised incorrectly as 480i.

    #26544
    2mg
    Participant
    #26545
    BuckoA51
    Keymaster

    For many TVs that information is simply inaccurate and lag testers such as Time Sleuth and Leo’s tester can prove it. I have yet to test a HDTV where there’s a difference in lag between e.g 720p and 1080p, though of course there are millions of displays out there so results can and do vary.

    #26547
    2mg
    Participant

    So does a line doubler like tink2x do PAL (288p) to 480p too? I won’t get some bizzare 48Xp out?

    #26548
    nmalinoski
    Participant

    288p linedoubles to 576p, not 480p.

    #26553
    2mg
    Participant

    Oh it doubles PAL too, didn’t notice that, nice.

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