Superimposing smoke 1

[theflickguy]

I'm trying to create an effect where the subject in a video is talking and I want to add puffs of smoke from his mouth as he talks (to look like he just took a drag of a cigarette). I have a video clip of smoke puffing against a black background, but if I try superimposing it over the clip it darkens the image and it's obvious to anyone that it is being superimposed. Any suggestions?

 

[Akribie]

Try different keying options. If the background is black, then luminance key may give best results.