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Thread: Frame creation points and fps

  1. #1
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    Question Frame creation points and fps

    I have began to do some frame creation from jpegs creating vector images. I am wondering what the range of points should be for each image. The max recommended points per frame and also what the average frame rate per sec usually is for a show.

    Thanks
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    Depends on your scanners. I have scanners that are tuned to 12K.
    Mine don't like any frame that are above 1000 points, at that point they start to flicker.
    I think 12 frames/second is a good point to start, but the higher the better. I think you still see some flicker at 12 fr/sec, maybe 18-20 is perfect.
    Of course if your scanners are tuned higher you can increase those values. 1500 points should be no problem for a 20K scanset and a 30K set can handle 2500 points for sure.

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    Just a matter of taste.
    I just hate flicker !
    I keep my points around 800-1000 @30kpps


    High pointcounts don't capture well on video either.

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    Is it straight math to get to calculate frames and points? Say scanners are 30Kpps is it points by framerate?>

    exp. 1000points X 30frames =30kpps
    2000 points X 15fps = 30Kpps
    ?

    Thanks
    John
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    The human eye perceives more than 12 images per second as a fluent image, if memory serves right. I think 12 flickers a bit but it is probably subjective from person to person.

    So you need more than 12 frames/second to reduce flicker. If your scanners are 12 kpps your image can have maximum (12,000 / 12 = ) 1000 points. 20 kpps around 1500 points, and 30 kpps around 2500.
    If your image has less than 1000 points the frame rate goes up and flicker reduces. If your image has too many points your image will start to flicker. You can reduce flicker by adjusting your scan speed so the scanners go faster, but this distorts the image. You have to find your equilibrum.

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    Quote Originally Posted by polishedball View Post
    I have began to do some frame creation from jpegs creating vector images. I am wondering what the range of points should be for each image. The max recommended points per frame and also what the average frame rate per sec usually is for a show.

    Thanks
    A good limit on a really good set of scanners is usually about 700-750 points for graphics. Better software and better hardware, and smaller angles, can change this. There is also a lower limit on what "looks good", usually 100-200 points, minimum.

    If your software does not do optimization, remember to add anchor points to sharp corners, and guide points to long blanking jumps.

    Modern software can interpolate, so you might wish to try that if you have pangolin.

    Steve
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    Quote Originally Posted by colouredmirrorball View Post
    The human eye perceives more than 12 images per second as a fluent image, if memory serves right.
    There is a difference between the number of "flashes" per second needed to remove flicker and the number of unique "frames" per second that are needed to give the illusion of continuous motion.

    The problem is that you need fewer frames (on the order of 6 to 8 per second) to perceive continuous motion, but many more flashes (30 or more for very high contrast images) to remove the flicker.

    A good rule of thumb is thus to design frames that reduce flickering, since as long as you are above 8 frames per second the motion will look smooth anyway. But this means that you need to run your animations at close to 30 frames per second. And if you are running at 30,000 points per second, that yields a maximum point count of 1000 points per frame. And in practice, it's better to be slightly below this.

    Adam

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    It also matters on how often you update the background images.

    If you have a sheriff walking through town to a gunfight, the ratio of the foreground updates to background frame updates matters, The Flintstones cartoon was "running on 5 or 6s", Vs Bugs Bunny running on 2s or 3s

    Steve
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