On Sun, May 18, 2014 at 2:52 AM, Lampe, Mattias SLC CT PEK <mattias.lampe@xxxxxxxxxxx> wrote: > I suppose there are probably many ways of doing it. I used GIMP [ ... ] > > It shouldn’t be too hard to even apply this kind of operation “on the fly”, > in real-time when recording the video, but that probably requires a bit of > programming. Although perhaps less than you might think. There is a really great library of image processing tools called Netpbm that has been around for ages. http://netpbm.sourceforge.net/ You should be able to find an API for most scripting tools so you should only have to write the glue logic. -p.