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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

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    $\begingroup$ Alpha Over node usually does the trick $\endgroup$ Oct 22, 2018 at 17:20
  • $\begingroup$ @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: blender.stackexchange.com/questions/7782/…. Thank you for suggesting Alpha Over node. $\endgroup$ Oct 22, 2018 at 17:57
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    $\begingroup$ You may find this link useful .... blender.stackexchange.com/questions/50771/… $\endgroup$ Oct 22, 2018 at 21:25
  • $\begingroup$ I have tried your suggestions and worked out the solutions. I got the desired result. Thanks, Duarte and Atomicbezierslinger $\endgroup$ Oct 23, 2018 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

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  • $\begingroup$ If your problem was solved by your solution, you should mark this answer as accepted. $\endgroup$
    – Leander
    Dec 10, 2018 at 13:24
  • $\begingroup$ 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. $\endgroup$ Dec 10, 2018 at 13:28
  • $\begingroup$ 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. $\endgroup$
    – Leander
    Dec 10, 2018 at 13:30

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