Ian Thompson-Bell wrote:
Yes, I tried that but after extending the canvas you get the chequerboard area in the 'spare' bit and when you paste and move the second image in it disappears behind the chequerboard - so I am on the right lines but doing something wrong.
This works (Gimp 2.6.7): From the menubar select Image -> Canvas Size, in the dialog window click on the chainlink icon (to unlink the dimensions), double the value in the width box, then in the Layers section at the bottom choose "All Layers". Copy your image, paste it, then use the Move Tool to move it into place.
I can reproduce the behaviour you describe by not choosing "All Layers" during the resize.
But Ted's montage solution sounds like the way to go.
-- Martijn