Ken Burns Effect Algorithm-Functions

[Sivakatirswami]

Alex... thanks... this is better, yes, but there is still the  
"twinkling" of pixels everywhere as it zooms in... if i open the same  
photo in iMovie and run a Burns effect zoom on it... it is absolutely  
smooth... Actually the "twinkle" effect would be a good for thing for  
children... but pros will sneer at it...

I would be interesting in understanding the fundamental differences  
from the "video physics" between the two technologies.. the Rev  
script is obviously just doing simple geometry...

I wonder how a movie technology differs...

Am I asking too much to try to get the same thing in Revolution?  (I  
expect so...)  My whole endeavor here is to avoid a heavy weight QT  
app for light weight internet delivery.


On May 17, 2006, at 12:59 PM, Alex Tweedly wrote:

> For images that are close to square, this "drift" won't be obvious  
> - but I think it will make the zoom less smooth.
>
> You can avoid that by calculating the revised height, and then  
> centering that around the height.
>
> function zoomIn tRect
>  put tRect into saferect
>  subtract 1 from item 1 of tRect
>  add 1 to item 3 of tRect
>  put ( (item 3 of tRect - item 1 of tRect) * tRatio) / 2 into  
> tNewHalfHeight
>  put (item 2 of tRect + item 4 of tRect) / 2 into tNewCentre
>  put tNewCentre - tNewHalfHeight into item 2 of tRect
>  put tNewCentre + tNewHalfHeight into item 4 of tRect
>  put saferect && tRect & cr after msg
>  return tRect
> end zoomIn