Natron - Non-faithful export

Software Natron
1

Hello

I am a beginner with Natron

I inserted on a video made under blender, a smoked video that was on a green background. I changed its color. The preview is good.
But the exported video does not match… A big white border appears.

Aperçu
Aperçu822×629 221 KB
Export
Export960×600 281 KB
Nodes
Nodes770×446 28.9 KB

Am I doing something wrong?

Thanks for your help

I use: Natron version 2.3.15 Release on Ubuntu 20.04

2

What does the Multiply node do?

3

The video original of the smoke is gray (on a green background). The saturation filters had no effect on this B&W image. I had to saturate it with a brown color to better integrate it on the floor. That’s what the multiplication filter is for.

4

Does your source footage have an alpha? If not check on the auto alpha box in the Read node of your footage that isn’t a greenscreen element.

5

I found this option in the “Merge” module itself. And indeed, it removes the white border… :slight_smile:

Thank you very much !