01-14-2021, 07:28 AM
You use Image>Canvas size to increase the size of an image (without scaling the contents), then import the other images using File>Open as layers (where you can select several images at a time).
If there is some usable overlap between the scans you can use a panorama-stitching application such as Hugin to do the work for you.
If there is some usable overlap between the scans you can use a panorama-stitching application such as Hugin to do the work for you.