Posted by Rick Merrill on 10/02/05 18:35

Mike Kujbida wrote:

> If you're familiar with the chromakey technique (think TV weather person),
> then this analogy will help.
> The "key" is the hole that is cut (what's left of the greenscreen, excluding
> the weather person, after some electronic adjustments are made) and the fill
> is what replaces the green screen (satellite map, location shot, etc.).
> Does that help?
>
> Mike
>

So why would one want the key(hole) to be on one channel and the
fill(background) on another? How would this be used to put a 'bug' on
screen?

...
> --
>
> The 2000 will support a “Key/Fill” mode for
> Targa frames, (automatic)
> MPEG-2 files, and (user)
> DV files. (user)
>
> For example, loading a file named "Logobug" on Channel 2 automatically
> loads the Logobug_ (Alpha Clip) onto Channel 3.
>
> For Targa files, the alpha clip name will be generated automatically
> during ingest via FTP. For DV and MPEG files, the user must
> use the same name as the 'fill channel' and explicitly save the alpha
> clip adding the underscore to the end of the clip – all prior to transfer.
>
> In Key/Fill mode, the transport controls of Channel 2 will
> control Channel 3, allowing 1x frame-synced playback of both Key and
> Fill channels. This mode will be invoked by clicking a check box in the
> GUI. Channel 1 will be available, as usual, for either playout or
> record. When not in Key/Fill mode, either file may be played back as a
> standard clip file.
>

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