travel mattes are cool.

as are things like chromakey - but keying anything - with compressed footage - just opens up a huge can of worms that end-users wont expect or understand.

i dont think many people understand the minimum requirements for getting a real and usable key off digital video....

i wish i could wave a magic wand that would not get people into trouble.
but keying is such a lot of trouble....if you dont start with very good quality footage - dv isnt anywhere near good enough...

to make keying work - like the professionals - you have to work with uncompressed footage. and you have to shoot on something that has proper colour sampling.

as an effect its possible to make something that is ok, but if endusers want it to look like the pro-s - they are going to be dissapointed.