The image that it manipulates will be grabbed from the portion of the screen underlying the window, or from the system's video input, or from a random file on disk, as indicated by the grabDesktopImages, grabVideoFrames, and chooseRandomImages options in the ~/.xscreensaver file; see xscreensaver-demo(1) for more details.

-window

Draw on a newly-created window. This is the default.

-root

Draw on the root window.

-mono

If on a color display, pretend we're on a monochrome display.

-install

Install a private colormap for the window.

-visual visual

Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

-delay microseconds

Slow it down.

-lenses

Instead of doing magnification we just copy an offset region from the original image. If lensoffsetx < pixwidth (and similarly for Y) then consecutive regions will overlap, giving the effect of looking through an array of lenses.

-pixwidth pixels

Width of the magnified pixels.

-pixheight pixels

Height of the magnified pixels.

-pixspacex pixels

Amount of black space between magnified pixels (X direction).

-pixspacey pixels

Amount of black space between magnified pixels (Y direction).

-lensoffsetx pixels

Distance in X direction between consecutive copied regions (only effective when -lenses used).

-lensoffsety pixels

Distance in Y direction between consecutive copied regions (only effective when -lenses used).

DISPLAY

to get the default host and display number.

XENVIRONMENT

to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.