I've used filters "Handling alpha channel" of KDEnLive and used a green background to cropping people (presenters of JT).
However, I would like now to embed videos like this:
But It's not working well... There are plenty of areas of semi-transparency in the flames which are not interpreted ...
Basically, it's as if a pixel could only be transparent or opaque (as GIF...) without alpha gradient that correspond to green gradient.
I can well add blur to slap, but it's still a flame surrounded by a large green edging ... It's the same problem with everything more or less transparent or translucent : smoke, clouds, glass, flare...
Do you know a way to convert gradients of green in degraded alpha more faithful?
(Precise Pangolin + KDEnLive 0.9.4)