narain, 1 month ago

@demofox It's basically a edge detection filter / finite difference gradient (convolve with [-1, 0, 1]) except applied in time rather than space.

Which suggests to me that convolving with [-1, 2, -1] (i.e. do sharpening instead of edge detection) may give more naturalistic results...

demofox, 1 month ago

@narain yeah or an unsharp mask maybe, like [-1/3, 1 2/3, -1/3].