XV Description
XV is an interactive image manipulation program for the X Window System.
It can operate on images 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 ghostscript (as we do), it can also display them.
XV lets you do a large number of things, including, but not limited to the following:
- display an image in a window on the screen
- display an image on the root window, in a variety of styles
- grab any rectangular portion of the screen and turn it into an image.
(This allows you to "snap" an image in any X-window!)
- arbitrarily stretch, compress, rotate or flip the image
- crop or pad images
- view files as ASCII text or hexadecimal data
- magnify any portion of the image by any amount, up to the size of screen
- determine pixel values and x,y coordinates in the image
- adjust image brightness and contrast with a gamma correction function
- apply different gamma functions to the Red, Green, and Blue color components
- adjust global image saturation
- perform global hue remapping
- perform histogram equalization
- run a number of image-processing algorithms on any rectangular
portion of the image
- edit an image's colormap
- reduce the number of colors in an image
- dither in color and b/w
- crop off solid borders automatically
- convert image formats
To get started simply type: "xv" and you will get a menu window. Click the "Load button to load your image.
The manual is available online.
There is an XV homepage.
Several accessory programs come with XV and they are explained in the individual "man pages":
bggen man page
vdcomp man page
xcmap man page
xv man page
xvp2p man page
Please Note: If you publish a figure using this program please cite the
following:
John Bradley
1053 Floyd Terrace
Bryn Mawr, PA 19010
FAX (610) 520-2042
Email: xv@devo.dccs.upen.edu