Files that contain the .tn file extension are normally associated with Tracor Northern image files. The Tracor Northern image file format is a proprietary file format that consists of images that each contain 512 rows, with each row containing 512 pixels.
A file with the .tn file suffix is usually only saved in the TN file format while it is being edited, as the TN format is not very suitable for distribution of a finished image file. In most cases, TN files are exported to the IMG file format once editing has been completed. When this occurs, the file is often re-saved with the .img file extension.
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