KB10157 - Can the AIC be used to convert an already rectified and georeferenced (registered) image to a new geographic coordinate system?

Yes. The image can be reprojected to a different coordinate system with the use of GCPs.

If the starting image is georeferenced, then it should be either a GeoTIFF or paired with an associated file containing the image registration information (such as a World File or a TAB registration file). The associated georegistration file should be saved to the same file folder on the PC as the image file. The procedure is:

1) Load the image file into the AIC Project Manager module and then double click on that file to open it in the AIC Editor module. If the AIC reads the georegistration information correctly (the AIC understands GeoTIFF, World Files, TAB registration files), the AIC will automatically place a GCP at each of the four corners of the image. If the GCP's are not present at the corners (indicating that the AIC could not read the georegistration information), then place the GCP points manually.
2) Close the Editor and save these GCP points.
3) In the AIC Project Manager module, check the “Use Projection” box and define the target coordinate system to which the new output image is to be generated.
4) Run the output image.

But consider that the above procedure only rotates and rescales the image. While this might be adequate if the image covers only a small territory, a better result can probably be achieved by using at least the 2nd order polynomial method, requiring the placement of a fifth and sixth GCP to the interior area of the image, in order to perform some 'warping' of the image – as well as rotation and rescaling. You might find that use of the 3rd order calculation, requiring a total of 10 GCPs placed relatively evenly across the image in order to perform yet more precise warping, yields yet a better reprojected output.