Green screen - minimum dimensions please !

[scrimski]

- I need something to tell me the rightmost, leftmost, topmost and bottommost pixel she has ever reached in this shot.

Just for curiosity(and I'm not sure if I got you right) What for?

I have been shooting on green screen and since I am doing this project for the web, I really need the size of the footage to be minimal.
You do know that you may scale down footage?

[nirishere]

I just want to use minimum bandwidth as necessary

[Mylenium]

- I need something to tell me the rightmost, leftmost, topmost and bottommost pixel she has ever reached in this shot.

Check Dan Ebbert's site (motionscript.com (http://www.motionscript.com)) There's a collision detection example using the sampleImage() method in CS3. With some modifications this can be used to detect layer boundaries.


I just want to use minimum bandwidth as necessary

But then you forget that this is not merely dictated by the resolution. If you use formats like H.264 or FLV, which use block-based compression, this would not really mean much if your resolution is so "crooked" that it gives the transcoder matrix a hard time. Really, reconsider: the whole point of any such compression must be to establish a temporally stable, favorable block pattern with relatively even bitrate allocations. In essence you could produce a lame duck by cropping, but an elegant eagle by giving some more space and letting the algorithms do their magic.

Mylenium

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