site_archiver@lists.apple.com Delivered-To: Pro-apps-dev@lists.apple.com Darrin On Dec 9, 2009, at 1:02 AM, Lu Nelson wrote: Hi, I'm hoping this message reaches someone who knows the ins and outs of QT/ProKit, and how Motion's ".motn" files are interpreted when used as media files: Let me explain -- I am using Motion with Avid Media Composer. or Not) when rendering, render to an Avid codec, and then import to Avid, but it involves several steps and is therefore slow. My problem is that although when rendering out of Motion, , when you choose to import a ".motn" file via Quicktime you get only Premultiplied Black. It is also possible to drag a ".motn" file directly to an Avid bin however (similar to how one can do in FCP) and allow Avid to import the file to disk, via On-the-fly-rendering -- courtesy of Quicktime; but in this case the alpha always comes through as Pre-multiplied Black. This is no good in Media Composer (MC only understands Straight alphas, and so whatever you import this way has a black halo around it). I may be wrong, but the only reason I can see for this is that QuickTime's default parsing of Motion projects is to assume alpha should be premult-black...and my question is whether there's a way to change this, so that these files will render in to the Avid with straight alphas? I'm hoping against hope, that there's a tweak, like "defaults write com.apple...." where I can change this parameter in QT or ProKit or whatever is responsible for this parsing Thanks! _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/dcardani%40apple.com -- Darrin Cardani dcardani@apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.ap... Lu, Motion always generates premultiplied alpha. You can't change that. However, doesn't Avid have a popup somewhere to set the interpretation of the alpha? It seems like most good editing apps do. If not, you could also see if there's an "unmult" plugin available somewhere. There used to be a free one for After Effects, but I don't know about Avid. This sounds like an issue on the Avid side that it's not letting you set the interpretation on the fly.

From Motion, it is possible to choose the Alpha type (Pre-multiplied

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