overlay a round clip

[trolltuning]

I have been playing around with some DV footage adding picture in picture (usually a closeup) with overlay. How would I go about overlaying a clip in the shape of a circle or an oval?

[stickboy]

You need to create a separate, greyscale image that represents the transparency mask.

Here's an example. (http://forum.doom9.org/showthread.php?s=&threadid=72445#post456800)

[trolltuning]

Thank you.
I'm assuming that with a no-frills paint program I just draw a square around whatever I'm creating the mask from, invert the colors and save as black and white?
Also that if I do it this way I can't make use of addborders for the picture in picture?

[stickboy]

Originally posted by trolltuning
I'm assuming that with a no-frills paint program I just draw a square around whatever I'm creating the mask from, invert the colors and save as black and white?I don't know what you mean by drawing a square. Do you mean making a square selection? Making a black square? making a white square? (And why a square? I thought you wanted a round mask?)

Anyhow, you set the mask to be white for areas that you want to appear and black for areas that you want to hide. Gray pixels will be partially visible.

So you open your image in your no-frills paint program, make a selection around what you want, fill that selection with white, and fill all surrounding pixels with black.Also that if I do it this way I can't make use of addborders for the picture in picture?Huh?

[trolltuning]

[QUOTE]quote: Also that if I do it this way I can't make use of addborders for the picture in picture?
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Huh?

When I overlay a square clip I usually add borders around it. If I do that with a round clip I guess I need to build them by modifying the mask if I want a round clip with a round border. Now that you've explained it I can play with it.

[stickboy]

You'd just need to call AddBorders on both the overlaid clip and on the clip's mask.