Re: [Cin] Blur plugin: Alpha determines radius

I also think it is a bug. If in Phyllis' example we put a track underneath with, for example, a colored background, activating the "Alpha determines radius" option makes that track disappear in the Compositor leaving a black background. It is as if this option took the black of the first track (which is 100% transparency) and transformed it into the color black (0, 0, 0), losing the transparency data and hiding the underlying colored track. The same is achieved using a gradient. Maybe the best thing is to hide the option (without needing to remove it from the source code) so that it is not available.