One, if in the process of operation, as long as the file is not closed, you can recover the photos through history.

Second, if the file has been saved and closed, the above method will not work. You can do this, import pictures with CDR and AI software, enlarge them appropriately and save them. Be careful not to enlarge it too much, otherwise it will affect the picture quality. Then use PS to open the processed picture and modify it to the original pixel size.