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Partial transparency question

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Sam Steti

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Partial transparency question

PostTue Apr 18, 2017 8:40 am

Hi guys,

I'm on a project where a lot of keying is involved. I can do it in - at least - 3 different pieces of software, but I chose Primatte in Fusion to stick with other co-workers habits, and it's ok this way...

Now, I'd say 12 to 15% of last and recent green BG clips were not really well shot imho, and some are very important to us, leading to my question : we have to wipe out some parts of images where we see... the wall, and not the green bg :D And we cannot re-shoot, of course. I prefer a question now before falling into a never-ending polygon trick...

Although I have my own ideas, what would you use as a repeatable and specific workflow to make this part transparent before export in PR 4444 ?
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Sander de Regt

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Re: Partial transparency question

PostTue Apr 18, 2017 8:47 am

I don't know what you mean by the 'neverending polygon trick' but I think you need to create garbage mattes - and yes that probably will involve polygons - although you can also use circles, rectangles etc.
You can do this straight on the Primatte tool to do it all in one go.
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Sam Steti

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Re: Partial transparency question

PostTue Apr 18, 2017 10:23 am

Thx a lot for this advice. I thought some may suggest matte controls stuff etc, but this is quite logic...

Actually my OP came from the fact that a co-worker exported 4444 PR keyed in Primatte, but not only the green had to be erased and he lazily did not, resulting in clips like donuts :) : talents over transparent BG, BUT the whole scene surrounded by orange walls and stuff...
Then, before taking these clips back in fusion, I preferred asking.
Thx again.
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Sander de Regt

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Re: Partial transparency question

PostTue Apr 18, 2017 10:27 am

Matte control tools are also very useful for situations like these. I don't know the shots, but it's hardly ever a one button solution. It might even be useful to pre-garbage matte the footage, before feeding it into Primatte, so that Primatte will get footage that is as clean as possible.
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Sam Steti

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Re: Partial transparency question

PostTue Apr 18, 2017 10:34 am

Thank you again, this is exactly what I concluded too ("pre-garbage matte the footage, before feeding it into Primatte, so that Primatte will get footage that is as clean as possible"), to focus on potential fine-tuning.

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