OK... this leads to larger, more fundamental questions on video sprit
still animation of any object, be it pan-zoom photo or just any
object moving across the screen:
Since screens are made of pixels, I always thought that a "sub-pixel"
position was a "vikalpa" (the horn on the hare, the cheese in the
moon -- a idea that has no basis in reality) But if indeed you are
correct that the reason e.g. Flash animation is so smooth, is because
movement is calculated across sub-pixels points, then this means that
one might try, for example:
set the topleft of image 1 to 1.121,12.675
This just doesn't work in Rev... nothing happens, no error and no
change in the image loc
As for a zoom function, in Rev. I think we can only address video
pixels as whole integers and that screen positions really are never
more than whole integer pixel positions, in any context...
Can anyone improve on the smoothness of this zoom function, just
import an image into any stack and add this buttondddddddddddd
local tRatio
on mouseUp
# set up a reset for testing purposes
if the uOriginalSize of img 1 is empty then
set the uOriginalSize of img 1 to the rect of image 1
else
set the rect of image 1 to the uOriginalSize of img 1
end if
put the height of image 1/the width of image 1 into tRatio
zoomIn
end mouseUp
on zoomIn
repeat 50 times
set the rect of image 1 to (zoomIn(the rect of image 1))
wait .5 millisecond
end repeat
# this is not too bad depending on the "continuoustoneness" of the
jpg.. the more "edges" the more pixelated the zoom appears.
end zoomIn
function zoomIn tRect
subtract 1 from item 1 of tRect
subtract 1 from item 2 of tRect
add 1 to item 3 of tRect
put ( (item 3 of tRect-item 1 of tRect) * tRatio) + item 2 of tRect
into item 4 of tRect
return tRect
end zoomIn
Sivakatirswami
On May 15, 2006, at 1:19 PM, Wally Rodriguez wrote:
The Ken Burns effect, as used in other applications, has to be
calculated on a sub-pixel level so that it does not look jerky,
that is because some combinations of start point, size and speed
could yield sizes or motion that can't be rounded to one pixel.
There must be a way to do this smoothly on the mac, since the
screen saver does it, but I couldn't even start to tell you how.
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