webcollage is written in perl(1) and requires Perl 5.

It will be an order of magnitude faster if you also have the webcollage-helper program installed (a GDK/JPEG image compositor), but webcollage works without it as well.

webcollage can be used in conjunction with the driftnet(1) program (the Unix equivalent of EtherPEG) to snoop images from traffic on your local subnet, instead of getting images from search engines.

-root

Draw on the root window. This option is manditory, if output is being produced: drawing to a window other than the root window is not yet supported.

-verbose or -v

Print diagnostics to stderr. Multiple -v switches increase the amount of output. -v will print out the URLs of the images, and where they were placed; -vv will print out any warnings, and all URLs being loaded; -vvv will print information on what URLs were rejected; and so on.

-timeout seconds

How long to wait for a URL to complete before giving up on it and moving on to the next one. Default 30 seconds.

-delay seconds

How long to sleep between images. Default 2 seconds. (Remember that this program probably spends a lot of time waiting for the network.)

-background color-or-ppm

What to use for the background onto which images are pasted. This may be a color name, a hexadecimal RGB specification in the form '#rrggbb', or the name of a PPM file.

-size WxH

Normally, the output image will be made to be the size of the screen. This lets you specify the desired size.

-no-output

If this option is specified, then no composite output image will be generated. This is only useful when used in conjunction with -verbose.

-urls-only

If this option is specified, then no composite output image will be generated: instead, a list of image URLs will be printed on stdout.

-filter command

Filter all source images through this command. The command must take a PPM file on stdin, and write a new PPM file to stdout. One good choice for a filter would be:

webcollage -root -filter 'vidwhacker -stdin -stdout'

-filter2 command

Filter the composite image through this command. The -filter option applies to the sub-images; the -filter2 applies to the final, full-screen image.

-http-proxy host:port

If you must go through a proxy to connect to the web, you can specify it with this option, or with the $http_proxy or $HTTP_PROXY environment variables.

-dictionary file

Webcollage normally looks at the system's default spell-check dictionary to generate words to feed into the search engines. You can specify an alternate dictionary with this option.

-driftnet [ args ]

driftnet(1) is a program that snoops your local ethernet for packets that look like they might be image files. It can be used in conjunction with webcollage to generate a collage of what other people on your network are looking at, instead of a search-engine collage. If you have driftnet installed on your $PATH, just use the -driftnet option. You can also specify the location of the program like this:

-driftnet /path/to/driftnet

or, you can provide extra arguments like this:

-driftnet '/path/to/driftnet -extra -args'

Driftnet version 0.1.5 or later is required. Note that the driftnet program requires root access, so you'll have to make driftnet be setuid-root for this to work. Please exercise caution.

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.

http_proxy or HTTP_PROXY

to get the default HTTP proxy host and port.