PDS_VERSION_ID                     = PDS3
RECORD_TYPE                        = STREAM
OBJECT                             = TEXT
  PUBLICATION_DATE                 = 2006-01-01
  NOTE                             = "Hints for opening THEMIS files in 
                                      the NASAView software package"
END_OBJECT                         = TEXT
END


NASAView is a Graphical User Interface (GUI) based display tool
designed to open most PDS complient archive data products.  The
software is offered free for Sun/Solaris, Linux, Windows/NT/95, and
PowerMac platforms at
http://pdsproto.jpl.nasa.gov/Distribution/license.html.  The THEMIS
team has been and will continue to work with the PDS software
engineers to maintain compatability between the currently available
version of NASAView and the THEMIS standard data products.

NASAView can be used to display the label and data contents of all
THEMIS QUBE and IMG files.  This file contains some basic instructions
to display a THEMIS image in an open NASAView session; please contact
the NASAView technical support for additional assistance and information. 


To view the label of a THEMIS file:
OPTION 1- Open the file as text
1) select FILE from the top menu bar
2) select OPEN TEXT from the drop down menu
3) browse your system to find the THEMIS file you wish to open
4) select and OPEN the file

OPTION 2- File is already open as an image (see below)
1) select LABEL from the top menu bar
2) select FULL LABEL from the drop down menu

The label should now be displayed in an Label/Text View window with a 
scrollbar.  When this window is activated, a new top menu bar is 
available to manipulate the text file.


To open a THEMIS file:
1) select FILE from the top menu bar
2) select OPEN OBJECT from the drop down menu
3) browse your system to find the THEMIS file you wish to open
4) select and OPEN the file

The file should now be displayed in an Image View window.  The 
QUBE CONTROL CENTER can be used to bring higher numbered bands (if 
available) into the View window.  Scanning through the BAND SELECTOR in 
the QUBE CONTROL CENTER will display each band in a new window stacked
on top of the previous windows.  The windows can be dragged aside for
easier viewing;  note however, once multiple windows of the same image 
have been generated, there is no easy way to tell which band is displayed
in which window.  (Also, this feature seems to break down with 1-band,
VIS-RDR QUBEs)

Click on the image window to activate it.  The display bar at the bottom
of the window gives the coordinates and the data value of the pixel under
the mouse pointer.  Once the window is activated, the image file can be 
manipulated in a variety of ways from the drop down menus in the top menu 
bar.


To alter the way the image is displayed:
OPTION 1- Automated stretch 
1) select IMAGE from the top menu bar
2) select one of the stretch options from the drop down menu

OPTION 2- Manual histogram stretch
1) select OPTIONS from the top menu bar
2) select VIEW HISTOGRAM from the drop down menu
3) adjust the median, minimum, and/or maximum displayed pixel value as 
   desired;  select another PALETTES if desired
4) select APPLY to see the results