Artefacts of strange colors while using yadif or tdeint

[Henox]

Hi all,

I have a general question about deinterlacers : if i use yadif(order=0) or Tdeint(mode=0,field=1,full=false,mi=255) (for example) on some parts of a video or frames, some artefacts appear or some distorsion of colors : the frame is deinterlaced but there is some "blue gamma", I don't realy know how to call that. Is there a reason to this or do I maybe set the deinterlacers more speficically ? What strikes me is that such problems are not always generated and I don't find a logical reason to this, it's like random.

artefacts can be some things which appear on a frame (like points of colors).

[Henox]

here is an example of that strange blue colors : http://img42.imageshack.us/img42/5766/bluegamma.jpg
I've just used tfm(order=0) here


here you have some brown artefacts on the head with tfm again, but it is same with yadif : http://img8.imageshack.us/img8/5861/artefactsb.jpg