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Forums Adobe After Effects AFX Rendering engine problem, subpixel motion

  • AFX Rendering engine problem, subpixel motion

  • DeathWolf

    May 5, 2005 at 4:47 pm

    Hi all,

    Well one more time i have an usual question.
    Basicaly i have noticed that when overlaying text in afx, and moving it
    subpixel motion is not very well managed.
    That is, if the movement isnt a multiple of 1 pixel, or 0.5pixel(halfpel)
    the overally moving text has some appearing “wobbling”(which is pretty
    logical since there’s imprecision in the size of the text)
    Of course a solution to that is to “manually change” the afx rendering
    by supersampling, applying everything in super sampled, and sampling
    down back, but that implies 2 resize plus a major time loss, and removes the
    ability to have everything in a single composition.
    So i was wondering if anyone knew a trick/solution/pref that i missed
    to get this to work decently.

    Thanks for any help,

    Paul-Kenji Cahier

  • Filip Vandueren

    May 5, 2005 at 5:36 pm

    I’ve noticed the same thing, and it really bothers me too.
    Especially slowly scaling up is troublesome on text and illustrator

    The crazy thing is that to my eyes bitmap-text out of Photoshop does not have the problem at all.
    So if you’re not animating using any special textacy stuff, consider that an oldschool workaround.

    It’s worth noting though, that the effect is more pronounced on the monitor than on a TV-screen, but see for yourself if the TV-output is acceptable.

    Adding a slight amount of Gaussian Blur (0.5 – 1 px) helps and is usually not a bad idea for text-output to DV and sorts

  • DeathWolf

    May 5, 2005 at 10:12 pm

    yeah, but using bitmap/prerasterized stuff introduces some sort of motion blur that’s somehow too strong… all of this is of course linked to the problem of rendering in discrete space but still… somehow i feel like the way afx calculates subpixel motion is not very good…

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