(05-06-2022, 06:51 AM)zeuspaul Wrote: I am not sure I understand the question..what is an AO image?
You can open the 512 x 512 image. Then resize the canvas to 1024 x 1024. Then duplicate the layer 3 times so you have four layers each with the same 512 x 512 image. Now using the move tool align the images. You will probably need to zoom. Then under the image drop down menu select merge visible layers.
edit: oops, Ofnuts is more experienced than I. His is a better solution than mine.
Indeed Ofnuts did it well even though the OP (IMHO) may have a bit of a XY problem, anyway the OP's explanations of what s/he want to achieve were good.
@tmanni, something that we (at least me) always forgot, GIMP has a tile tool easy to use, that's a nice solution.