Export Undistorted images

Hi Guys, I found how to export undistorted images (through Registration Export, selecting Undistorted images and imagelist in the output format), but the options are confusing concerning the parameters of the export.
Is there any document explaining a bit the parameters ? My images have the same sizes of original ones, while they shoukld have a slighty different format given the mustach distortion. I would like to have a format that reflect the “overscan”, to use it in other softwares.
Any advice ?
Thanks !

Hi OCHIN

Can you please make screenshots of used settings for undistorting data ? in what application are you importing the data ?