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RedHat 9 (Linux i386) - man page for xscreensaver-getimage (redhat section 1)

XScreenSaver(1) 					      General Commands Manual						   XScreenSaver(1)

xscreensaver-getimage - put some randomly-selected image on the root window
xscreensaver-getimage [-display host:display.screen] [--verbose] window-id
The xscreensaver-getimage program is a helper program for the xscreensaver hacks that manipulate images. This is not a user-level command. This program selects a random image, and puts it on the specified window. This image might be a snapshot of the desktop; or a frame cap- tured from the system's video input; or a randomly-selected image from disk.
xscreensaver-getimage reads the ~/.xscreensaver file for configuration information. It uses these settings: grabDesktopImages Whether it is acceptable to grab snapshots of the desktop. The security paranoid might want to turn this off, to avoid letting people see (but not touch!) your desktop while the screen is locked. grabVideoFrames Whether it is acceptable to grab frames of video from the system's video input. Grabbing of video is done by invoking the xscreen- saver-getimage-video(1) program. chooseRandomImages Whether it is acceptable to display random images found on disk. Selection and loading of images is done by invoking the xscreensaver- getimage-file(1) program. imageDirectory When loading images from disk, this is the directory to search. The directory will be searched recursively, and all files in it are assumed to be images. If none of the three options are set to True, then video colorbars will be displayed instead.
If the target window is not the root window, then this program will always grab a desktop image. This means that if an image-manipulating xscreensaver mode is run in a normal window, it will always operate on a desktop image; it's only when it is run in -root mode (or when invoked by xscreensaver) that it will load image files or grab video.
X(1), xscreensaver(1) xscreensaver-demo(1) xscreensaver-getimage-file(1) xscreensaver-getimage-video(1)
Copyright (C) 2001 by Jamie Zawinski. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.
Jamie Zawinski <>, 14-Apr-01 X Version 11 03-Feb-2003 (4.07) XScreenSaver(1)