how to fade in luma effect

clip on top of video is a black on white image (.png) with composite mode set to 'Stencil Luma'.
this looks just the way I want it to, and I have animated it so it moves diagonally as the guy is speaking.
But I can't for the life of me figure out how to have this upper image fade in/out.
Perhaps there is a better way to accomplish this effect?
TIA,
gretta

We had another thread about this.

Comp modes and transitions/transparency seem to work not reliable.

Take your PNG, open in PS or similar, copy the PNG foreground to the alpha channel, invert, and make the foreground black. Save with alpha. Import into FCPX and it will work.

-Andreas

You could use this, it will work.

www.fcp.co/forum/utility/17263-luma-mask#27800

Connect a colour generator above the clip and apply the "Luma Mask" effect to that. You'll need to export your animated PNG as a video file, bring that back into an event and apply it to the drop zone.

Then just add a "Cross Dissolve" transition to the generator and your set.

I have found an easier workaround for this, I have put it in a little video. You can watch it here:

vimeo.com/72405366

Or download it from here:

we.tl/vOrHUCyxIg

In short:

1. Blade the underlying clip at the end of the PNG, and where you want the PNG to start dissolving out.
2. Copy the bladed section and paste it on top of the PNG.
3. Add a Dissolve to the start of the pasted section.

It's still a workaround, but it does the trick in less than 10 seconds.

- Ronny

Ronny,

very good workaround.

But to me it looks a little bit like introducing tracks into a trackless app

Here an example of that what I suggested before (you have to reconnect and replace media)
dl.dropboxusercontent.com/u/63959366/example.zip

-Andreas

Andreas,

I have tried your suggestion and it works well. There are many ways to skin a cat
But still these are workarounds. I have sent feedback to Apple about this issue.

- Ronny

Ronny,

It's good to send issues like that to Apple. With this thing I know several people who sent feedback to Apple.
Let's hope they listen to us.

-Andreas