Photo booth .qtz's in iMovie

Question

Hi,
I am trying to do a green screen effiect in iMovie without a green screen. This is possible in photo booth with the background effects. I have been suprised to find that these effects are not available in iMovie. This question has been asked before and I have seen threads were people say that iMovie is not powerful enough to do this. I would think that if photo booth can do this in real time then iMovie would be possible enough to render this? - or am I missing something?
Basically my question is, does anyone know how to use this effect in iMovie or is there a work around to produce this effect?
Thanks
Eds2020

Answer 1

eds2020 wrote:
.... does anyone know how to use this effect in iMovie or is there a work around to produce this effect? ...
no, this effect can not be used in iM.
when you use the effect in PhotoBooth, you see how it works:
you create a shot of the bg without you
this is used as in any pic processor creating a 'difference mask' to the live scene
the resulting 'black' is used for a luma-key
.... but this is a very ... rude method, far from quality, iM could create.
esp. luma-keying is a bit … 'say old-fashioned.
the green-screen is superb in iM, no fancy colors or equipment needed. get any green cloth (I'm using a 4€ 'fleece' blanket, avoids reflections)  as background, try to illuminate it, keep a distance btw. subject and bg (zoom or use iM's green-screen crop tool), there's no need for a green studio!
... funny thing: a perfect lighted bg does work worse in iM than a 'bad' lighted one