[ Japanese ] I created a video filter for VirtualDub (free video processing software) called "Afterimage". This generates afterimage effect, a kind of motion blur effect also known as "light trail" effect. Useful for time lapse movies of night skies, especially meteor showers: with this filter, meteors will fade to disappear, instead of being shown only in single frame. It is also possible to generate star trails.
This is a HD movie, so please enable HD mode and view it fullscreen.
Sorry but source code is not yet available.
UNZIP, then copy vdf file to "plugins" subfolder in your VirtualDub folder. If you do not yet have VirtualDub, you can get it from http://www.virtualdub.org/
How to use
- Multiplier: greater value result in greater effect.
- Subtractor: smaller value result in greater effect.
"Multipier = 1.0 & subtractor = 0" result in light is eternally persistent, to generate star trails.
It simply applies this calc for each R, G and B channels:
- P1 = last frame
- P2 = source frame
- P1 = Multiplier * P1 + (1.0 - Multiplier) * P2 - Subtractor
- Result = Brighter (P1, P2)