To Load an Image into the Image Display Buffer (Frame): . ... Type the pathname of the file containing the image data in the SAOtngDialog window which appears, or . ... If the file is FITS, but either is too large or is specified as an image extension or a binary table, the file automatically is processed by the external fitsextract program and displayed. ... If the file is not in FITS format, SAOtng checks its extension list to see if the file contains a recognized image file extension. ...