NAME

       fv - a tool for viewing and editing FITS format files

SYNOPSIS

       fv

DESCRIPTION

       fv  is  a  FITS file viewer and editor developed at the High Energy Astrophysics Science Archive Research
       Center (HEASARC) at NASA / GSFC.

       To start up fv on Unix workstations, enter `fv' in a command window. You can optionally append  the  name
       of  a FITS file, or multiple files, to be opened. For example, `fv ngc1316o.fit' opens a single file, and
       `fv ngc*' opens all the FITS files in the current directory whose name matches the string. On Windows PCs
       you  can start fv either by double clicking on the fv desktop icon, or by dragging a FITS file from, say,
       Windows Explorer onto the fv icon. It is also possible to set up your Windows or Unix environment so that
       you  can  just  double  click  (in the File Manager or on an e-mail attachment) on a FITS file that has a
       standard extension like `.fit' or `.fits' and then have fv automatically start up and open that file.

OPTIONS

       -cmap m
              Set the colormap.

              m=0 Default behavior.  I.e. choose the "best" colormap.

              m=1 Force POW to setup a new private pseudocolor colormap (very safe)

              m=2 Force POW to use truecolor mode (very safe, but looks bad  on  low  color  displays  and  runs
              slower  than pseudocolor).  Note: this will cause powSetupColormap to look for a truecolor visual;
              if it can't find one, it will allow the main Tk code to pick a visual,  but  POW  will  still  use
              "truecolor mode" (i.e. the Tk photo widget) to display images.

              m=3  Force use of the screen default colormap. This should be reasonably safe now, but often won't
              be what you want.

       -winmanager 1/0
              Turn Window manager On and Off.

       -quiet Startup fv without open dialog and stay open even if all files are closed.

       -module modName  or -modName
              Load a web module into fv.

       -version
              Display fv Version.

       -user  Logon with user ID.

ENVIRONMENT

       The environment variable FVTMP defines what directory fv will use to create temporary files.

AUTHOR

       Text            copied            from            heasoft's            web            page             at
       https://heasarc.gsfc.nasa.gov/docs/software/lheasoft/ftools/fv/doc/startFv.html

SEE ALSO

       The program is documented fully by the online help that can be accessed from the built-in help viewer.