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Old September 13th, 2008, 05:03 PM   #1
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Transparency

I'm wondering if anyone can tell me what I am doing wong here.

I created a video for a bottom third to go over footage of a boxing match. The video I created has "nothing" outside the graphics & text I inserted using a PSD file & the media generator. When I rendered it, the file shows my bottom third stuff, with black everywhere else. So far so good.

I inserted this into the top video layer of a preliminary version of the Boxing video, and it works great! The only place it covers anything is where my graphics & text are. So I decided to try on it on the newest version of the video & for some reason it covers everything, no transparency. I can use chroma key to erase the black background from the overlay, but I don't want to do it that way.

So my question is why does one file allow it to be transparent with no chroma key filter & the other one needs a mask to "erase" the black background? Apparently I did something in the layers that is making this happen, but I have checked the properties carefully & i can't find anything different, besides that I added color correction filters. Mostly this is just an academic question, I have already finished this project, I just wanted to make some better graphics for the next time I do this (in a few weeks) and I was hoping to re use the project file, and just change the overlays.

Maybe it would just be better to start from scratch? Anyone have any ideas?
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Old September 13th, 2008, 06:19 PM   #2
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Hi Justin

I think what you're saying is that you effectively want to treat the black as an alpha channel?

I think to do this you need to render as Quicktime. When you've selected "Qucktime" from the Render screen - click on "Custom" - then click the "Video tab" - select "Animation" as the Video Format.

Then when you bring it into your next project - right click on the event and select "Properties" -> "Media". Then select any of the bottom 3 options - no idea what the difference is - but they all seem to work.

Ian
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Old September 13th, 2008, 07:35 PM   #3
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Thanks Ian, I will try that. I rendered as an AVI Intermediate file, and it worked for some magic reason in one project, but not another.

I just wish I knew what was different that made the second one not work.
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Old September 13th, 2008, 09:21 PM   #4
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If you're rendering the lower third to an AVI file, change it to UNCOMPRESSED, open the "custom" screen, and make sure the "Alpha channel" is turned on.
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Old September 14th, 2008, 05:20 AM   #5
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That works, Thanks a ton!
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