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<h2><a name="overview">Overview</a> </h2>
<p><i>xv</i> is an interactive image manipulation program for the
X Window System. It can operate on <a name="formats">images</a>
in the GIF, JPEG, TIFF, PBM, PGM, PPM, XPM, X11 bitmap, Sun
Rasterfile, Targa, RLE, RGB, BMP, PCX, FITS, and PM formats on
all known types of X displays. It can generate PostScript files,
and if you have <i>ghostscript</i> (version 2.6 or above)
installed on your machine, it can also display them.</p>
<p><i>xv</i> lets you do a large number of things (many of them
actually useful), including, but not limited to, the following:</p>
<ul>
<li>display an image in a window on the screen</li>
<li>display an image on the root window, in a variety of
styles</li>
<li>grab any rectangular portion of the screen and turn it
into an image</li>
<li>arbitrarily stretch, compress, rotate or flip the image</li>
<li>crop or pad images</li>
<li>view files as ASCII text or hexadecimal data</li>
<li>magnify any portion of the image by any amount, up to the
size of the screen</li>
<li>determine pixel values and x,y coordinates in the image</li>
<li>adjust image brightness and contrast with a gamma
correction function</li>
<li>apply different gamma functions to the Red, Green, and
Blue color components, to correct for non-linear color
response</li>
<li>adjust global image saturation</li>
<li>perform global hue remapping</li>
<li>perform histogram equalization</li>
<li>run a number of image-processing algorithms on any
rectangular portion of the image</li>
<li>edit an image's colormap</li>
<li>reduce the number of colors in an image</li>
<li>dither in color and b/w</li>
<li>crop off solid borders automatically</li>
<li>convert image formats</li>
</ul>
<p>Oddly enough, I'm still having a horrible time tracking down
some minor bug in the <i>Automatic </i><a
name="checkbook-balancing"><i>Checkbook</i></a><i> Balancing
Module</i> , and once again it fails to make it into the official
<i>xv</i> distribution.</p>
<p>The <a name="ghostscript"><i>ghostscript</i></a> distribution
is available via anonymous ftp from <a
href="ftp://prep.ai.mit.edu/pub/gnu/"><tt>prep.ai.mit.edu</tt></a>
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