Exporting Alpha Transparency for a PC from motion5...?

Question

I am trying to export alpha transparency for a lower third I've done in Motion5.
I know that proress422(proxy) can be used , but this does not import well into my PC (premiere pro).
Is there anyway of creating alpha transparency from m5 so that my PC will happily recognise it ?
thanks,

Answer 1

If you're using Alpha for *anything* -- you must use ProRes 4444 (if Premiere will accept it.) It is the only ProRes that supports transparency and the only export option in Motion 5 that supports transparency. (Older versions of Motion could export with the "Animation" codec which also supported transparency.)
If Premiere (on the PC) doesn't handle ProRes 4444, then
You can export just the alpha channel from Motion and use a "Track Matte Key" in Premiere (as I *understand* it -- I've never used premiere.)
On export, go under the Render options panel and set Color: to Alpha (default is Color + Alpha).
It's basically a B&W movie of the alpha data -- the "layer" is used as a luminance map in the travel matte key. I actually don't think it matters what codec you use for export -- it's not really transparency -- black is transparent and white is opaque.
HTH