How to stretch the edge of a picture.

[rich2005]

No info on your OS but another way is seam-carving using a Gimp plugin liguid-rescale

see: http://liquidrescale.wikidot.com/

briefly: Paint in a 'keep' mask. Set the new width. Apply and hope it comes out the way you want.

Looks like: screenshot https://i.imgur.com/YJQv9wX.jpg

gives