Vegas 19 - AI Animation provided bad green BG for chroma key

Thomas-Monks wrote on 12/8/2024, 12:17 PM

Greetings !

Above are 4 screenshots. The first one, is my prerendered AI composite of car, dog and man driving it. The AI created a rather dark green background for chroma key. Unfortunately, when trying to key the image using RGB 0,1,0... I get this really bad shadow. This image is PIP video with bad green BG - NOT CHROMA KEYED. I placed a proper 0,1,0 green background beside it.

The next image (#2) is the result when chromakeyed.

I'm hoping for some way to either change the green BG to a proper one, OR find a way of making the existing dark green BG work.

For experimentation, I've included both original images (#3 & #4)...should you wish to play with it.

I thank you all in advance.

Tom

 

Comments

john_dennis wrote on 12/8/2024, 4:03 PM

@Thomas-Monks

Download This: https://drive.google.com/file/d/1x1L2u6TS94pidwYuW365P05YfJ1PLjHO/view?usp=sharing

UltraVista wrote on 12/8/2024, 9:13 PM

I'm hoping for some way to either change the green BG to a proper one, OR find a way of making the existing dark green BG work.

You use the eye dropper on the background to select the exact green.

Slightly related when animating the car I noticed at some preview window sizes parts of the image shimmer such as dogs fur, wheels, windscreen, even though preview is set to BEST/FULL. With this setting it should always correctly show me the same result as the render. If this is to do with low quality scaling then Vegas should have a BETTER/FULL setting that uses high quality scaling.

(Vegas then Resolve at different preview window sizes)

Thomas-Monks wrote on 12/9/2024, 1:13 AM

THANK YOU !!!

I see that my problem all along was THRESHOLD HIGH / LOW SETTINGS. I don't understand this before, but rest assured I will remember it forever :-)

THANK YOU BOTH,

Tom

 

mark-y wrote on 12/10/2024, 2:59 PM

@Thomas-Monks

Green for the Universal Green Screen Standard is precisely 0, 177, 64 RGB; meaning, red is set to 0, green is set to 177, and blue is set to 64.

I know of no practical way to synthesize precise RGB numbers in AI. Seems likely to cause frustration.

  • Using a mask in Vegas, Choose 0, 177, 64 as your background color.
  • Replace any colors that are green in your original retained image with something else, to prevent them from disappearing.
  • Experiment. A lot. Learn the basic technique, and feel encouraged to ask informed questions of your forum peers as they come up.
  • Your Vegas Help Menu, as well as a wide range of public resources, addresses this and other basic techniques in Vegas Pro. You may wish to consult them first, and then ask here on the forum, which gets clogged with new user questions, usually the same ones, this time of year. Thanks and Best of the Holidays.
  • https://www.vegascreativesoftware.info/us/forum/got-questions-consult-the-tutorials-first-please--120282/