After requesting the Filter SDK I feel oblieged to publish my filter, although it is probably of low interest for most people
Code:
Overview:
One problem of the transfer of Super8 films to digital media is the inhomogenous
brightness produced by projectors. Usually the brighness drops in a circular
fashion from the center to the rim. This filter was written to counteract this
problem. (Alternatively it can be used to create the same flair ;) )
Usage:
Super8Equal(clip, center[float, 1.0], rim[float, 0.0], min[float, 0.0], max[float, 2.0])
center, rim: The brightness of pixels is multiplicated by a factor calculated
by linear interpolaration from the center factor to the rim factor,
dependant on the distance from the center of the picture.
The rim factor is reached in the corners of the picture.
min, max: These are cut off values. The factor will never go below min or
above max.
The filter is for AviSynth 2.5.x and works in all color spaces (the brightness alteration
is a bit diffrent between the RGB color spaces and YUY2/YV12).
Many thanks to Simon Walters for his sample on which this was built
Edit:
Download it
here.
Cheers
Belgabor