SideFX Houdini Tutorial Unscripted : Keying A Green Screen

in real productions they have really good green/blue screens,
and screens like cr*p, and no screens but brute force roto and
everything inbetween. and lots of film grain, greenspill and
whatnot.
no real magic, instead lots o' late night work, knowledge and
experience.
when keying off something you want to use

Also, one of the reasons is that they either use 35mm film or a very high end digital camera to shoot their scenes. Low end digital cameras use something called "chroma subsampling," which means that it records its color information in a lower resolution than its luminance resolution. This means that when you pop it into a chroma keyer, you get a very blocky key without a lot of work.
35mm and cinema quality digital cameras are the way to go. Of course they're also extremely expensive.

Great Tutorial !!!!!!!!!!!!!!!!!!!!!!

in house tools, great lighting, and compositors that have been compositing for many years. They have tools we cant even imagine. They use shake etc but they also use there own plugins etc. that they have written in house for shake etc. Its not like they use it out of box.

i know right? maybe they might bring it back in like a different suite of apps or somehting like that... it still S**ks that you cant get it noiw, though.