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Can someone tell me how to stretch an image section.

I've tried and am failing. I'm using Gimp 2.10. I can't get to grips with the controls.

I make a selection and then use the Scale Tool to stretch.

Great. Except...

- When I click away I find it hard to unselect.
No matter what I do, the white ants STILL surround.

- When I click away, the bit I had stretched, no dissapears!

- Sometimes I managed to succeed (somehow!!).
But then a line 2 pixels are missing - why!!!?

What am I doing wrong?

What I want to do is a 60 second job.
I've trawled through youtube videos - I cant find any dedicated to what I want to do.

What I want to do might be there... but it's in the middle of a much longer video!

Any pointers would be great.

Just to illustrate, take the pic below. Say I want to stretch the right hand said and make it similar length as the left side.
(Doesn't matter if the right side looks stretched and odd - just using the pic as an example, nothing else.)



Thanks.

ACTUALLY...
Something else... to try and achieve a similar effect, something I used to do in Photoshop was copy the right section, flip it so it's the mirror and then join on the right. If the image is blurred, this helps extend and not look odd. How could I do this?

Double thanks if I can get an answer to the above. ?

To stretch the right hand side:

1. Make a selection on the right hand side.
Click inside the selection to finalise (Free Select tool - double click inside)

2. Edit > Copy or Ctrl-C

3. Edit > Paste or Ctrl-V
You get a Floating Selection in the layers dialogue. Right click and select To New Layer

4. Image > Canvas Size and increase the width.

5. Select the Scale Tool and scale the new layer. "Keep aspect" option in the Tool Options must be off.

Note:
Static dotted line is a layer boundary.
Moving dotted line (marching ants) is a selection. Select > None to unselect.

To flip and join the right hand side.
Do steps 1 to 4 above.
Then use the Flip Tool to flip the new layer horizontally. Use the Move tool to move the layer into position.

Alternatives:

Does not flip the moved border but `Layer -> Transform -> Offset does a shift. Then some patching needed to blend the joint.

[attachment=2727]

An old third-party plugin, liquid rescale http://liquidrescale.wikidot.com/ Not so easy to use until you get to grips with it. Usually used to size up or down but a size down then a bit of editing on the mask and size back to original size. You can see by the banner bottom of the image the stretching.

[attachment=2728]

You guys are amazing
THANK YOU

@rich2005, that looks great
I'll give that a go as well.