This content has been marked as final. Show 12 replies
Depending on how you created your lens flare, you may need to apply "Unmult" or "Xmult" to the layer in order to get an alpha channel on footage. Then, you have to render to a codec that supports embedded alpha channels. Do you see a proper alpha channel when you solo that channel in the comp window?
I have never heard of 'Unmult' or Xmult'! I have been putting the lens flare on a solid layer hoping that I can just render it with an alpha channel as I would text. Also I'm not sure how to solo the view. I guess I shouldnt be using a solid layer? Sorry not to have too much knowledge on this problem.
Did you try a google search for unmult?
You can apply the lens flare on a solid layer (usually black solid). Then apply the unmult effect.
At the bottom of the comp window, there should be a little tri-colored icon that you can click on and solo R, G, B, or A. Solo the alpha channel, and see if it looks correct. If it's completely white, you're not going to be able to composite your lens flare over anything unless you use a transfer mode, like, screen.
> Thanks Steve,
> I have never heard of 'Unmult' or Xmult'! I have been putting the lens flare on a solid layer hoping that I can just render it with an alpha channel as I would text. Also I'm not sure how to solo the view. I guess I shouldnt be using a solid layer? Sorry not to have too much knowledge on this problem.
> Thanks again,
Get Unmult here. Free download.
To preserve alpha channel, render out quicktime using animation codec,
"Millions of Colors +"
It should then work in Final Cut with the transparency you desire.
Of course, you could always use luminance as alpha for these purposes, so long as you render against a black bg, any non-black area is the lens flare, so it should translate well for a wipe.
Thanks guys will try these.
You can also apply the Lens Flare to a black solid, and render without an alpha channel (QT Animation is a good choice). Then add the rendering to the timeline in FCP and change the layer's Composite Mode to "Screen."
- Jonas Hummelstrand
Thanks for your help. How do I render without alpha an channel? I only seem to have RGB, alpha and RGB alpha options.
Thanks a lot.
Jonas means render RGB, not RGB+alpha. This will provide you a file with no alpha (transparency). By using the "Screen" or "Add" compositing mode in FCP, you'll see the lens flare but not the black pixels.
That works perfect. Thanks very much all.
Here's what I do...
Generate a lens flare against a black solid.
Add the "Shift Channels" effect to the layer.
Set the "Take alpha from..." setting to "luminance"
Add the "Remove color matting" effect.
make sure it is set to remove black.
then render out to a format that supports alpha and you are good to go.