Provided by: skycat_3.1.2+starlink1~b+dfsg-5build1_amd64 bug


       skycat - A tool for displaying astronomical images and catalogs


       skycat filename -option value ...


       The ESO Skycat tool combines the image display capabilities of the RTD (Real-Time Display)
       with a set of classes for accessing astronomical catalogs locally  and  over  the  network
       using  HTTP.  The tool allows you to view FITS images from files or from the Digitized Sky
       Survey (DSS).


       -file filename
              Specify a FITS file to display. '-' means read the file from  the  standard  input.
              The  '-file'  part  is  optional, so you can also simply specify a file name. Image
              compression and decompression is done automatically, based on the file name suffix:
              .gzfits  or .gfits for GZIP compression, .hfits for H-compress, and .cfits for UNIX

       -cat bool
              If bool is 1, include 'Data-Servers' menu in the menubar (This is the default). The
              'Data-Servers'  menu  gives  you  access to the ESO Archive extensions for browsing
              astronomical catalogs, plotting objects in the image window and getting images over
              the network from the image servers, such as the Digitized Sky server.

       -rtd bool
              If  bool  is 1, include the Real-Time menu in the menubar (default is 0). The Real-
              Time menu gives you access to the VLT Real-Time Display features,  such  as  camera
              control  and  rapid  frames.  To  use  these features, the rtdServer daemon must be
              running on the local host. A client application, linked with the  Rtd  image  event
              library can then send images via shared memory to be displayed in rapid succession.

       -float_panel bool
              If  the option value is 1, the skycat info panel is put in a separate popup window,
              leaving more space for the image window (The default is off).

       -panel_layout <saoimage | reverse | default>
              With this option you can change the order of  the  zoom  and  pan  windows  in  the
              layout.  The  default  layout is: zoom window on the left, info panel in the center
              and pan window right. If "-panel_layout saoimage" is specified, a layout similar to
              saoimage  is used (info panel, pan window, zoom window). If "-panel_layout reverse"
              is specified, the order of the windows is the reverse of the default.

       -remote bool
              If "-remote 1" is specified and a skycat process is already running,  the  existing
              skycat  process is sent a message and asked to open a new window and the new skycat
              process exits immediately. This has the advantage of sharing the image colormap and
              using  fewer system resources, however it depends on being able to use the Tcl send
              mechanism. For security reasons, Tcl send will not work if you  are  using  "xhost"
              based X security. You need to use X-auth security. See the "Tcl/Tk Tools" book from
              O'Reilly for more on this topic.

       -min_scale n

       -max_scale n
              Specify the min and max scale values for the Magnification menu.   Negative  values
              shrink  the  image,  positive values zoom in closer. The default values are -10 and

       -port portnum
              Specify a port number to use for the remote  RTD  socket  interface.  See  the  Rtd
              User's  Guide for details on this socket based interface. By default, a port number
              is chosen automatically and written to the file ~/.rtd-remote.

       -disp_image_icon bool
              If bool is 1 (default), display a miniature version of the image in the tool's icon

       -default_cmap <cmap>
              Specify  the  default  colormap.  This  should  be  one  of the names listed in the
              'Colors' popup window (default is 'real').

       -default_itt <itt>
              Specify the default intensity transfer table. This  should  be  one  of  the  names
              listed in the 'Colors' popup window (default is 'ramp').

       -colorramp_height <pixels>
              This option can be used to change the height of color bar (the widget at the bottom
              of the screen displaying the image colors).

       -with_colorramp bool
              If bool is true, display the color bar (default).

       -with_zoom_window bool
              If bool is true, display the zoom window (default).

       -with_pan_window bool
              If bool is true, display the pan window (default).

       -dozoom bool
              If bool is true, turn the zoom window on automatically (default).


   File menu
              Open and display a (FITS) image file.

              Reload the image display after the image has changed on disk.

       Save as...
              Save the current image to a file.

       Save region as...
              Save a section of the current image to a file.

              Print the current image to a file or printer.

       Clear  Clear the image display.

       New Window
              Display up a new main window.

       Close  Close the main window and exit if there are no more windows.

       Exit   Exit the application.

   View menu
              Display a window for manipulating the image colormap.

       Cut Levels...
              Display a window for manipulating the image cut levels.

              Display a graph of pixel values along a line drawn interactively over the image.

       Pick Object...
              Select an object or star in the image and display statistics.

       Fits Header...
              Display the FITS header for the current image.

       Pixel Table...
              Display a table of pixel values surrounding the mouse cursor.

              Set the magnification factor of the image display.

       Hide Control Panel
              Toggle the visibility of the upper control panel

       Hide Popup Windows
              Toggle the visibility of the popup windows.

   Graphics menu
              Display the line graphics toolbox.

       Mode =>
              Select the drawing mode.

       Width =>
              Set the line width for drawing.

       Arrow =>
              Select the arrow mode for lines.

       ArrorShape =>
              Select the arrow shape for lines.

       Fill =>
              Select the fill color for drawing.

       Outline =>
              Select the outline color for drawing.

       Stipple =>
              Select the stipple pattern for filling objects.

       Font =>
              Select the font to use for labels.

       Smooth =>
              Set the smooth option for drawing polygons

       Clear =>
              Delete graphic objects.

       Delete =>
              Delete selected graphic objects.

       Hide Graphics
              Toggle the visibility of the image line graphics

       Catalogs =>
              Select a catalog from the menu.

       Image Servers =>
              Select an image server from the menu.

       Archives =>
              Select an archive from the menu.

       Local Catalogs =>
              Select a local catalog from the menu.

   Real-time menu (displayed when -rtd 1 is specified)
       Attach Camera
              Attach the real-time camera - start receiving images.

       Detach Camera
              Detach the real-time camera - stop receiving images.

       Set Camera...
              Set the real-time camera name.

       Rapid Frame
              Create a rapid frame by interactively drawing a rectangle on the image.

   Help menu
       About Skycat...
              Display a window with information about this Skycat version.

              Display information about Skycat in netscape (if netscape is available).


              If set, this is used as the URL to access  the  skycat  configuration  file,  which
              contains  the  list  of  available  catalogs and how to query them. By default, the
              configuration file is also searched for in $HOME/.skycat/skycat.cfg, and if that is
              not found, in the ESO default URL:

              If  set,  this  variable  should  be a colon separated list of files or directories
              containing skycat plugins. A skycat plugin is a Tcl script that defines a Tcl  proc
              to be called for each instance of the main window. The script is sourced before any
              windows are created and can also load  shared  libraries  dynamically  to  add  new
              features.   See the Skycat User's Guide (
              for more information.

FILES - default configuration file.