How to get proper fill/key using SDI broadcast license

[robertwinter]

I'm having an issue getting the proper fill out of a Quicktime Animation. I'm using a broadcast license and an AJA Kona SDI board that outputs both the fill and key.

The Quicktime has a fill that is a gradient from white to black. The key is grey, which make it semi-transparent. The fill should pass directly to the output unchanged so it can be externally keyed. Right now, it's keying the animation over black, which is turning it grey on the output.

Is there a shaping setting I should be using on the texture to make this work properly and not effect the key output?

[robertwinter]

For future reference, the solution was to use an Alpha Blending node with the associated Quicktime.

[Dierk Ohlerich]

Hi,

I assume you are using internal hardware keying.

I just checked the code, and I found a bug in Ventuz: When using AJA boards, the button to switch between additive and multiplicative keying is inverted. So in order to get multiplicative keying, you must set it to additive. At least until we fix it in the next Ventuz release.

It's a live option, so you can change it on the fly without restarting Ventuz.

If that does not help, then there's something wrong how the movie is decoded or rendered. Use the "Alpha" button next to the render window in the designer to check the alpha output. You might need to play around with the alpha node to ensure the right color and alpha is output. If you are really confused, and this stuff gets confusing really fast, switch to external key+fill, and look at both signals with an SDI monitor.

-- Dierk