Chroma key after fixing movement in motion

Question

I created baseballs flying around in fcp with a sky background. The moves were jerky so I sent to motion and smoothed the movement. I brought it back to FCP applied the chroma keyer to remove the green screen. When I do that the green goes away but the background goes black. Why does the sky layer below disappear when I turn on the chroma keyer?
Also why doesnt motion have croma keyer. Color keyer does not work as well as chroma key.

Answer 1

dougleax wrote:
I created baseballs flying around in fcp with a sky background.
You created them? You mean you edited together some video clips of baseballs? Or you mean you animated a graphic of a baseball? Big difference. Big difference in how we will advise you to move along.
-It is a video of rotating baseball against a green color animated to look like being thrown.-
dougleax wrote:
The moves were jerky so I sent to motion and smoothed the movement.
You should only process the original media. I cannot tell from this statement if you know how stabilization actually works. If you are chromakeying the stabilized video clip, you may want to perform additional work on it. For instance, is the shutter speed high enough to reduce image blur? Is the footage interlaced?
-No stabilization used. The movements is FCP were Jerky between keyframes. FCP motion is hard to control. Thats why we use Motion...to smooth the movement..correct?
dougleax wrote:
I brought it back to FCP applied the chroma keyer to remove the green screen.
Ah. So your original statement about creation in FCP was misleading or incompletely descriptive. Is this a still image of a baseball against green? Or are these video clips of off screen hands tossing baseballs across the screen? If they're video, don't stabilize them, reshoot it with the camera on a tripod.
-I brought it back to FCP. When I did the original Chroma Keyer was lost.-
dougleax wrote:
When I do that the green goes away but the background goes black. Why does the sky layer below disappear when I turn on the chroma keyer?
Then you're not using the keyer properly. You may be looking at the matte or the processed key and not the output or final image.
-turn on keyer the green goes away and the sky image appears where there was green, but the rest of the background goes black.-
dougleax wrote:
Also why doesnt motion have croma keyer. Color keyer does not work as well as chroma key.
The blue/green keyer in Motion is fabulous. Why are you using the color keyer?
-From what I see in tutorials, people suggest to use Primatte RT. In FCP Color keyer has more control over how it affects highlights and shadows, Hue range.-
Motion has 5 keying options. FCP has about 10. I just like the was Chroma keyer works for my purposes.