I´m workin with a Media Composer Adrenaline.

How could I export a file that contains alpha channel the same way is done in Adobe Photoshop?

Thank everybody outthere giving solutions.

cachobri

right you are, Kevin. I had overseen the word "contains" and thought he wanted to export a separate file with only the alpha channel.

sorry if i misguided anyone.

thanks to both of you, Kevin and Daapap.

OK, no Daapap, you didn't misguide me, I just couldn't understand your method, now everything is clear, thanks to Kevin's and your clarifications. 

But it would be a nice feature if Avid could export with alpha chanel, wouldn't it?

I already did export the alpha channel just as Daapap says. Imprting again the two separate files as Kevin says i was able to aply aninmatte promote the effect to 3D and have lots of gadgets to aply. It was fun.

Thanks Daapap, Kevin and Sep for your interest and yor time.

Cachobri

Happy you could do your alpha export, however, I would insist about Daapap suggestion !

Yes it would be VERY VERY good to be able to export footage + alpha in 1 file !

Can you hear us Avid ? I'll re write a new post on requests / suggestion forum.

cachobri, if this is what you wanted (have i overseen anything else?) i would suggest something much simpler than extracting, exporting and re-importing.

normally you cannot matchframe clips with an alpha channel like keys, titles, imported graphics and movies with alpha aso. but after entering "subsys monpane debug" in the console (ctrl+6) you get rid of the annoying "precomputes cannot be loaded ..."-message.

now matchframing the clip (lets say a title) you will see two videotracks in the player. V1 is the fill, V2 the key. If you edit them back into the timeline instead of the original clip and then apply the matte effect onto the key-track you will have the same result as before but with separate key- and fill-tracks.

Thanks for the tip Daapap, I´ll try it tomorrow. I´ll let you know the results.

Cachobri