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First off, I'm a novice to node compositing, so I might not understand some jargons.

Below is the original video. enter image description here

Next photo: the white background is removed (my first time with invert node). The background is turned transparent. Now how do I lay this overlay upon another video or image with any different colour? I'd like to try medium brown ground or yellow for the lower ground.
enter image description here

Rita Geraghty
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    Alpha Over node usually does the trick – Duarte Farrajota Ramos Oct 22 '18 at 17:20
  • @Duarte, I had tried Alpha Over before and failed. I think I have used it wrong, but I will try it again tomorrow (my computer at work). I will try your suggestion, when I follow instructions at this thread from the past: https://blender.stackexchange.com/questions/7782/how-do-i-use-nodes-to-combine-two-images-when-both-have-transparent-areas. Thank you for suggesting Alpha Over node. – Rita Geraghty Oct 22 '18 at 17:57
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    You may find this link useful .... https://blender.stackexchange.com/questions/50771/rotoscoping-to-a-transparent-background/50776#50776 – atomicbezierslinger Oct 22 '18 at 21:25
  • I have tried your suggestions and worked out the solutions. I got the desired result. Thanks, Duarte and Atomicbezierslinger – Rita Geraghty Oct 23 '18 at 15:55

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The next day... I have tried Alpha Over as was suggested. Initially, it was tricky and difficult to work with nodes, while making mistakes. Now, I have finally achieved the desired result and here I enclose the screenshot. enter image description here

Rita Geraghty
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  • If your problem was solved by your solution, you should mark this answer as accepted. – Leander Dec 10 '18 at 13:24
  • Leander, are you sure? Originally, I thought that might be cheating, if I ticked my own answer as accepted and gave myself 15 points. That was what I thought previously. – Rita Geraghty Dec 10 '18 at 13:28
  • Read the 2nd bullet point from accepting an answer. There will be no change in reputation points. You can also change the accepted answer anytime if another answer is written. – Leander Dec 10 '18 at 13:30