[Sean Webb]

I shoot two greenscreen shows with multiple Canon XH-A1s (posted at shakeitup.tv) and lighting of the greenscreeen is the biggest factor in getting a good greenscreen shoot.

Lighting may also be your issue with artifacts coming from the camera. Low light will add artifacts 9 out of 10 times. If you want to have a dark/normal picture, it’s always best to overlight your scene (without over-driving the CCDs), then increase black and dim the highs in post later. If your artifacts are showing up on the green screen, you need better/more even lighting on the green.

Look at the first few seconds of the G-Lab Episode 7 (that will be posted in a few hours, but is up right now in iTunes), and you will see the green backdrop I assembled with painted drywall and painted floor (flat paint). Notice the differences from some shadows vs the well lit areas. The entire screen is well lit (four soft lights for JUST the green backdrop), but there is still variance that requires me to adjust tolerances to get all the green out in post.

I use the chroma-keyer option in FCP, as that it works better and is sharper that the green screen filters.

Hope this helps.
Sean@ShakeItUp.TV