Clean dissolves with chroma-key?

I've been doing allot of chroma-key work, and I've been wanting to dissolve from one chroma shot into another. What happens is the foreground image goes transparent during the dissolve and shows the background. I've fixed this by exporting each cut which basically turns the composite into a solid file. But it's a HUGE pain. I have to make sure I have handles for the dissolve, and on a large timeline it's very cumbersome. Is there some kind of command within FCP that will allow me to sandwich the composite without having to export?

I agree it's a pain, but if you think about it, that's the way it has to work. You could run into the same issue in the old linear machine cutting days. In the middle of the disolve, when the forground in semi transparent... you're gonna see through it to the BG.
It really should be a basic command to instantly sandwich (render? don't they have a word for this sort of thing like in photoshop? raster-somthing?) a composite image, without having to export.
Problem is it would still take time to render and you still have the issue of handles. The answer of course is hindsite. Now that you know about it, do the exports as you build the edit.
And remember that you don't have to export the entire clip, just blade both tracks a few seconds after the dissolve point, pull both tracks up a set of tracks, trim them to allow for handles, export, bring it back in and line up to the cut point.
Sounds like alot but if you keep the clips short the will export quick.
rh

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