Using luma key for video transition

[Deaf_Guy]

I downloaded a free transition from Stock. It starts off with black and then colored shapes fly around and then back to black. So I used the luma key to key out ther black to make the transition. See below screen shot.

It looks clean overall but there's an ever so slight black edge around the colored shapes, so I just wanted to make sure this is best way to get rid of black or is there a better way to do this? Any advice is appreciated. Thank you.

[Peru Bob]

Are you sure it is actually black?  I would expect it to have an alpha channel with transparency.

Does it look different if you render the timeline?

[Deaf_Guy]

Hi - thanks for your reply. When you put the clip, which is a MOV file, on timeline it's black. Here is the transition clip:

https://stock.adobe.com/video/dynamic-black-and-white-transition-vertical-animation-with-v-shapes-co...

I'm guessing the black really is black but I may not be familiar with alpha. If it alpha let me know a better way to do this. Thank you for your help.

[R Neil Haugen]

Black in the Premiere Program monitor doesn't necessarily mean black ... simply the absence of value. So if you have a pixel with no data for it that will appear black in the monitor.

I'm back to PeruBob's question. Have you rendered the timeline?

Neil

[Deaf_Guy]

Hi - I did export it from the timeline. Below you can see it. The first sample is with the luma key keying out the black from the clip and revealing the deaf people. Shortly after that is the exact same clip only with the luma key turned off. You'll see how the black covers up the deaf people.

You can see it here:

https://drive.google.com/file/d/1ZpJyp_zgck3OoT2_6jwsJi-S8ErgQTO-/view?usp=share_link

[Peru Bob]

When I said "render the timeline" I meant press enter to create preview files, not export.

[Deaf_Guy]

OK I rendered everything and it looks exactly like the export - first part the luma key works, second part with luma turned off the black is there

[Peru Bob]

If there is black, and not transparency, then either Premiere Pro is not recognizing transparency in that clip, or it is a badly created file.

[Deaf_Guy]

Maybe when the person who made it exported it as MOV they didn't select the alpha option during export?

[Peru Bob]

It's a possibility.