[atoav]

As a freelance VFX-artist the thing that annoys me about examples like these is that they don't honestly shou you the edge cases where things start falling apart (and they usually do).

A guy with dark hair in front of a white wall? I could luma key that in 10 seconds. The book example is more interesting, but there you can already see a bit of chatter (which might have to do with compression and noise tho).

In your defense you probably aim at a different target audience than people like me.

[ygra]

Well, the first video with the girl in the desert shows a case where things usually break down and they do so here too.