integer For halfword data, this is the range of dn values that will displayed as 0 to 255. default= (0,4095). No effect for byte data.
String Name of text file in SRCH format which contains the file specs of the images to be displayed.
keyword Any valid entry for scale will display images at full resolution. Default is to zoom to fit the entire image on the display screen. VALID: NONE, FULL, NORMAL, NOSCALE.