I have to render an image sequence with alpha for compositing with a real video.
I use “Key” in rendersettings and save the sequence as TGAs in RGBA.
But every motion blur is rendered against black.
I have tried it with:
- VBlur with nodes
- OSA / FSA
- rendered as PNG/TGA/TIF
I have only a bad compressed preview of the background video and for flexibility I have to deliver an image sequence with alpha. There is no chance to render the objects against the final background.
In 3D Studio Max there is “no premultiply” that is working with real motion blur, 2D blur and other 2D Filters, too. Maybe Blender need an additional premul mode?
In this case the color channels have the full intensity and only the Alpha has the gradient.
Any ideas? Is this possible with blender?
I have an additional alpha calculation in the sample blend. Without the calculation i have the same problems.
simple_VBLUR.blend (199 KB)