I’m writing this down so that I don’t forget it – I’ve been through this learning curve a couple of times and keep forgetting how to do it.
If you google “drawing an outline of a bitmap in Flash” you’ll come across lots of posts that simply say “trace your bitmap and then …”
Well it’s the tracing the bitmap bit that is the problem – using “modify->bitmap->trace bitmap” gets you part of the way, but isn’t the whole story. I’ve seen people describe the problem as have an outline draw on the screen and then a picture fill in. The response: “trace your bitmap and then …” but “trace bitmap” gives you a vector image with each color as a separate object. So putting a stroke around it will put a stroke around each color, not the whole image.
Instead, try this:
1 – Copy your bitmap. Put it on a different layer using “paste in place” (hide the layer to keep it out of the way if you do it this way) or keep a copy on the clipboard – we’ll use this later).
2 – Trace your bitmap. Hey, I’m not trying to be funny, here. Seriously, use (for CS4) “modify->bitmap->trace bitmap” – set the options to a high color threshold (the default 100 works – doesn’t really matter, this is just a template) but set the minimum area to 1 pixel so that the edges match up (I may be wrong on this, but it worked for me). Leave Curve Fit and Corner Threshold to normal – this is close enough.
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