RE: [Avid-L2] Re: Dilate fill

"Do these concepts apply to dialate fill?"

Not from Bruce's description, no. Think more along the lines of ringing.
It's for premultiplied shapes that have hard edges - it'll effectively
slightly soften those edges to prevent any minor artifacts appearing.

Tony :)

HD Heaven Limited (company no: 04620550) is registered in England and Wales
at Branston Court, Branston Street, Birmingham BL8 6BA

-----Original Message-----
From: Avid-L2@yahoogroups.com [mailto:Avid-L2@yahoogroups.com] On Behalf Of
johnrobmoore
Sent: 30 September 2009 20:07
To: Avid-L2@yahoogroups.com
Subject: [Avid-L2] Re: Dilate fill

This sounds a lot like what GVG switchers refer to as shaped or unshaped key
sources. Chyrons were shaped but certain sources were unshaped. I've heard
the term premultiplied vs straight in similar context. The bottom line is
the fill video shaped or premultiplied and then key applied or is the fill
video ragged and oversized letting the key signal shape it. Stepping into a
straight title and a softened title shows the difference in the fill video
straight being crude and oversized and the softened being the shape with
softened edges. Do these concepts apply to dialate fill?

--- In Avid-L2@yahoogroups.com, "Bruce Wilhelm" <bruce.wilhelm@...> wrote:
>
> >> What is it? New to me and no mention of it in the help file.
>
> This option was added in one of the v3.0 patch releases.
> It bleeds the fill just a bit along the edges where transparent alpha
> meets non-transparent alpha.
> This is to prepare it for the subsampling conversion to YUV 4:2:2 for
> compression and the subsequent conversion back to 4:4:4 for keying.
> It's mostly intended for importing graphics files containing alpha
> that have abrupt transitions between transparent and opaque.
> It can help prevent black/gray pixels from seeping into the fill.
> Anything that contains softened or anti-aliased edges
> (ie: Title Tool images) will not need this option, since the
> transitions between transparent and opaque is spread over several
> pixels.
>

------------------------------------

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