NWE Help: Graphics: XV: Overview

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XV is an interactive image manipulation program for the X Window System. It can operate on images in many formats on all known types of X displays. It can generate PostScript files, and with ghostscript (version 2.6 or above), it can also display them.

XV lets you do a large number of things (many of them actually useful), including, but not limited to, the following:

• display an image in a window on the screen
• arbitrarily stretch, compress, rotate or flip the image
• crop or pad images
• grab any rectangular portion of the screen and turn it into an image
• determine pixel values and x,y coordinates in the image
• adjust image brightness and contrast with a gamma correction function
• edit an image's colormap
• reduce the number of colors in an image
• dither in color and in black & white
• crop off solid borders automatically
• convert images from one format to another

This documentation will cover the ways you can use XV to get those things done. If you wish, you can learn more by experimentation or by reading the massive original XV manual.