<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="GENERATOR" content="Microsoft FrontPage 2.0"> <title>XV: Overview</title> <meta name="FORMATTER" content="Microsoft FrontPage 2.0"> </head> <body background="images/blutxtr2.jpg" bgcolor="#ABABD6"> <p> <a href="http://www.trilon.com/xv"> <img src="images/small_banner.gif" width="630" height="25" border="0"></a> </p> <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> </p> <hr color="#000080"> <p> <MAP NAME="FrontPageMap"> <AREA SHAPE="RECT" COORDS="393, 0, 453, 24" HREF="image-window.html"> <AREA SHAPE="RECT" COORDS="331, 0, 387, 24" HREF="release-notes.html"> <AREA SHAPE="RECT" COORDS="263, 0, 323, 24" HREF="manindex.html"> <AREA SHAPE="RECT" COORDS="164, 0, 254, 24" HREF="index.html#Table+of+Contents"> </MAP> <img src="images/navbar.gif" width="630" ismap usemap="#FrontPageMap" height="25" border="0"> </p> </body> </html>