Chroma Key transparency
Well, I have some time on my hands so I thought I'd 'play' with the chroma key FX in Vegas Pro 9e - just for fun (like you do). However, I am rather disappointed by the fact that I can see the background through my foreground image (me!)
I have a well lit shot of me against a good flat green cloth (came with Pinnacle Studio) and I have tried a number of different video backgrounds including a rather darkened interior of a church. I can understand that perhaps the windows may show through but it's things like straight lines i.e. the back of the rows of pews that come through too.
I've tried fiddling about with the threshold but 0.00 was the strongest image of me, I used the preset 'green background, which gave better results than using the eyedropper. I assume I am correct in putting the foreground above the background on the timeline.
Sony Vegas Pro 9e
gallons of coffee