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grads-2.0.2-1.fc18.x86_64.rpm

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<title>GrADS Command: wi</title>
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<h2><b>wi</b></h2>
<p class="style1">
N.B.: This command was deprecated long ago and is not included in GrADS version 1.9 or later. 
<p>The <code>wi</code> (write image) command dumps an exact copy of the
  contents of the GrADS graphics screen directly to an image file. This
  feature is implemented by means of an interface to the <a
href="http://dao.gsfc.nasa.gov/software/grads/win32/latest/pc-dist/doc/magick/ImageMagick.html">ImageMagick</a> library.  The syntax is:
  
<ul><code>wi <i>filename.fmt</i></code></ul>

<p>
where <code><i>filename</i></code> can be any meaningful file name,
and <code><i>fmt</i></code> is one of the ImageMagick supported
formats: gif, bmp, cgm, eps, fax, ico, jpeg, pcx, hdf, <a
href="http://dao.gsfc.nasa.gov/software/grads/win32/latest/pc-dist/doc/etc/img-formats.htm">and
many more</a>.

<p>
<h3>Usage Notes</h3>
<p>
<ol>
<li>Because it requires a connection to an X-server, <code>wi</code>
does not work when running GrADS in batch mode (-b option). A similar
command that <i>does</i> work in batch mode is <a
href="gradcomdprintim.html"><code>printim</code></a>.

<li>Some ImageMagick formats (tiff, png, mpeg, et al.) are not yet
supported by GrADS. If a specified format is not recognized or
supported, the image will be saved in MIFF, ImageMagick's native
format. If a file name extension is <i>not</i> specified, GIF is the default. 

<li>Make sure no other window is on top of your GrADS graphics windows
when issuing a <code>wi</code> command, because <code>wi</code> takes
a snapshot of the current state of this window. If another window is
partially covering your graphics window, your image file will contain
the combination of these 2 windows.

</ol>

<p>
<h3>Examples </h3>
<p>
To try out <code>wi</code>, display something on the graphics screen,
and then at the ga-> prompt enter:
<p>
<ul>
<code>wi test.gif </code> for writing a GIF file<br>
<code>wi test.jpeg</code> for writing a JPEG file<br>
<code>wi test.bmp </code> for writing a Windows BMP file<br>
</ul>

<h3>Bugs for Win32 GrADS Users</h3>
<p>
<ol>
<li>On Windows 95 systems, GradsHDF, the version built with the NCSA
MFHDF library, has a subtle bug when reading certain 16-bit (short)
packed NetCDF files (e.g. NCEP re-analysis files converted to
NetCDF at CIRES/CDC). Although GrADS is able to produce a plot, it
mistankenly produces very large values for a few grid
points. Work around: use GradsNC in such cases. This problem has not
been reported on Windows NT systems.<br>

<li>X Windows widgets built with gs scripts may miss/delay some X
events (keyboard/mouse clicks). This problem appears to occur only on
Windows 95; it has not been reported on Windows NT.<br>

<li>Athena widgets built with gui scripts: menu items become invisible
when selected (MI/X Server only); some mouse delays on Windows 95. <br>

<li><code>wi</code> has been reported to produce black and white GIF
output on VGA systems with more than 256 colors. The workaround is to
write a JPEG image, or to change your Windows display to 256 colors.
</ol>


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