PNG, GIF, JPEG, TIFF and BMP images will be as large (in pixels) as they are currently displayed, i.e. you can adjust their size by zooming prior to saving.
Note that all of the above will save the image as it is displayed, i.e. either scaled to 8 bit plus colortable, or as 24 bit color image. That means, the pixel values will not correspond to their physical meaning (count rate in kHz, if that's what you are currently displaying). To retain the true pixel values, you can save the image as 32-bit float TIFF. However, this image format won't be displayed properly by many mainstream image viewers / editors. One program which handles 32-bit float TIFFs properly is ImageJ5.2. Caution - if you are currently displaying raw integer scan data, they will be converted to float in this case.
Spectrum plots will be quite low quality for PNG, GIF, JPEG, TIFF and BMP images, since they are just screen dumps from the display (to a certain degree, you can adjust their size by changing the size of the SM_GUI Window and therefore the size of the plot window). EPS files will be nice vector plots. Marked positions (vertical lines) and fitted peaks will be included in the file if the "Include Vertical Lines in Spectra" entry in the submenu is checked.
The file will always be saved in little-endian mode (which is used by all x86 platforms).
Holger Fleckenstein 2008-07-08