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1992-01-02
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This is an official annoucement of availability of the latest and
greatest new version of XV, an interactive image display program for
the X Window System.
It's available *now*, via anonymous ftp on the machines 'export.lcs.mit.edu'
and 'grip.cis.upenn.edu. The file is called 'xv-2.00.tar.Z' and is located
in the 'contrib' directory on export, and in the 'pub' directory on grip.
The latest version of XV will be maintained on these two machines.
Many new features have been added to XV in the last year, far too
numerous to be listed in their entirety. Some of the more interesting
ones are:
* a directory browser that allows you load and save image files anywhere on
the system
* new formats: Sun Rasterfiles, Postscript, GIF89
* dithering and smoothing commands
* a colormap editor
* greatly expanded 'Color Editing' window with hue remapping,
saturation adjustment, intensity graph, and separate
r, g, and b intensity graphs
* spiffy new controls
Brief Description:
------------------
XV is a program that displays image files in GIF87, GIF89, JPEG,
PBM/PGM/PPM, Sun Rasterfile, and X11 Bitmap formats. XV runs on
nearly ALL X displays: 1, 4, 6, 8, 16, 24, and 32-bit, color,
greyscale, and black/white.
XV displays one image at a time in an output window, or on the root
window. You can arbitrarily stretch or compress the window, and the
picture will be rescaled to fit. You can rotate the picture in
90-degree steps. You can flip the picture vertically and
horizontally. You can repeatedly 'crop' a picture (define a
rectangular 'region-of-interest' and 'throw away' the rest). You can
magnify any portion of the picture by any amount, up to the maximum
size of your screen.
XV allows you click on the picture to determine pixel RGB values and
x,y coordinates. You can perform arbitrary 'gamma correction' on the
picture both in RGB space and HSV space. You can specify the maximum
number of colors that XV should use, for some interesting visual
effects. You can have the program produce a stippled version of the
picture using black and white, or any other pair of colors.
XV can write images in a variety of formats, with many of the
modifications you may have made to the picture saved as well. You can
use XV to do format conversion. XV will also automatically uncompress
compress-ed files, as well as read files from stdin.
John Bradley University of Pennsylvania - GRASP Lab
bradley@cis.upenn.edu
January 2, 1992