fv - a tool for viewing and editing FITS format files
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.
- -cmap m
- Set the colormap.
- m=0 Default behavior. I.e. choose the
- 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
- 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.
- Startup fv without open dialog and stay open even if all
files are closed.
- -module modName or -modName
- Load a web module into fv.
- Display fv Version.
- Logon with user ID.
The environment variable FVTMP defines what directory fv will use to create
Text copied from heasoft's web page at
The program is documented fully by the online help that can be accessed from the
built-in help viewer.