How to extend an Image from side to side softening the hard edge of image

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Thanks for the Help, I updated the Link, I copied this post from another site and it put ... in it, I did not notice:
https://www.youtube.com/playlist?list=PL...fvNkVm3m6c

Now I just need to write a Bash Script and see if I can do this from the Command Line Interface (CLI), has anyone done this before? I will search to figure out, thanks.