Computer-generated imagery (CGI) is the application of computer graphics to create or contribute to images. Some astronomy and Earth images were made with CGI, and flat-Earthers incorrectly use the fact as “evidence” the objects in the images are not real. In reality, it is possible to use CGI to create images of real objects, and therefore, CGI is not evidence that the objects in the images are not real.
For example, most images in IKEA’s catalog were created using CGI. If we were to use the same flat-Earthers’ “logic,” we can conclude that IKEA products do not exist, but we all know they exist.