Hi there,
We just tried to make a little app to take pictures in front of a greenscreen and the preview should also do the live keying. our problem is that there is a huge green "halo" around the persons and the keying is very "picky" (so if there is a tiny little brigher/darker sport it displays the green instead of the chosen background)
does anyone of you know a good apk or some tricks to deal with that? help would be really apprechiated as we get very desperate here 
best regards
Ben