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Render optics with alpha channel - No automatic transparency

Posted: Tue, 13th Oct 2009, 12:48pm

Post 1 of 5

KKB-FILM

Force: 1400 | Joined: 4th Jan 2005 | Posts: 37

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I downloaded an optic preset from the download section:

http://fxhome.com/presets/view/2328/liquid-energy-layer-1

Made an animation with the "liquid energy layer 1" and a "lens flare 35mm", but no setting gave me a rendered file with transparent BG.

The alpha channels where detected when imported into AE and "premultiplied - matted (black) box was ticked. Even though, the animation was shown with black BG.

However when I rendered the "Liquid Energy" and the "Lens Flare" animations as seperate files, I got the "Lens Flare" into AE with transparent BG... but NOT the liquid energy.

I gave up until I figured out, through a tutorial about something totally different, to switch the "Liquid Energy-animation" file to "Blend Mode" in AE.. and voilà!

So what I´m wondering is: WHY doesn´t particular optics from VLab get imported with automtic transparent background?

Tnx in advance =)
Posted: Tue, 13th Oct 2009, 1:06pm

Post 2 of 5

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

It's because the liquid energy preset has a composite filter applied - in this case a 'Gleam' filter. Because the composite filters require the layer to be flattened, it prevents export including alpha.

If you remove the gleam filter you can export the liquid energy effect (or both effects combined) with alpha.
Posted: Tue, 13th Oct 2009, 1:22pm

Post 3 of 5

KKB-FILM

Force: 1400 | Joined: 4th Jan 2005 | Posts: 37

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Thanks =)

As of I want the "Gleam filter on.. will rendering it and set the blend mode in AE to "screen give any loss of quality, or make any change to the animation?
Posted: Tue, 13th Oct 2009, 1:25pm

Post 4 of 5

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

It won't cause a loss of 'quality', but it will probably look different.

The 'composite' filters in VisionLab are designed for when you're performing the final composite in VisionLab. If you're doing the final comp in AE or another product, you'll need to apply the post-processing stuff there - I imagine AE has an equivalent filter.
Posted: Tue, 13th Oct 2009, 1:33pm

Post 5 of 5

KKB-FILM

Force: 1400 | Joined: 4th Jan 2005 | Posts: 37

VisionLab User VideoWrap User FXhome Movie Maker

Gold Member

Well, cant really find any differences with the screen mode on.. but gonna make a new "energy effect" in AE anyways.. But I´ve learned something new thanks to you..

Tnx for the fast replies, appreciated =)

Kim Krohn Berle