color keying selects everything

[marinezo]

hello, I'm in quite an urgent need for help. I shot a video with a green screen, and now I am trying to key the background. by the keying applies on everything - including objects which arent the green screen BG. What do I do ?!

[Mylenium]

Nobody can tell you anything without seeing screenshots and knowing your settings.

Mylenium

[marinezo]

sorry. here's the image before keylight color keying

here it is after "keylight", where the keyed color is a sampling of the BG:

there's noise generated by the similar hues

[Mylenium · Accepted solution]

You could draw a garbage matte (Inner/ Outer Mask) seems simple enough on a static shot. Otherwise you should seriously consider reshooting under better light conditions. There's barely any contrast in the channels and in fact it's surprising that you still get a reasonably acceptable key. This will also be difficult to deal with come time for color grading.

Mylenium

[kirkeric]

Hello, reshooting with better lighting will certainly help.  If you are unable or at least want to try an alternative, I always adjust with a curve with greenscreen before I key it.  Try a curve, brighten it some, add a little contrast, then apply the key.

I imagine there is some significant spill too on the ball.

Eric

[Dave_LaRonde]

Here's another vote in favor of a re-shoot.  The problems with this shot are:

• The foreground subjects to be keyed are underexposed.
• The subjects are too close to the green screen, leaving them susceptible to a lot of spill from the green screen.
• The subjects and the green screen are not lit separately, further enhancing the probability for a lot of spill.

And once you re-shoot, you can also fix something that should have never happened in the first place.  You can white balance the camera.

[Szalam]

Consider this a third vote for reshooting. That footage looks terrible for keying. White balance, light properly, and things will be much easier.