Provided by: xscreensaver-screensaver-webcollage_5.34-2ubuntu1_amd64 bug


       webcollage - decorate the screen with random images from the web


       webcollage  [-display  host:display.screen]  [-root]  [-window-id id] [-verbose] [-timeout
       secs] [-delay secs] [-background bg] [-no-output] [-urls-only]  [-imagemap  filename-base]
       [-size   WxH]   [-opacity   ratio]   [-filter  command]  [-filter2  command]  [-http-proxy
       host[:port]] [-dictionary dictionary-file] [-driftnet [cmd]] [-directory dir] [-fps]


       The webcollage program pulls random image off of the World Wide Web and scatters  them  on
       the  root  window.   One  satisfied  customer  described  it  as  "a  nonstop  pop culture
       brainbath."  This program finds its images by doing random web  searches,  and  extracting
       images from the returned pages.

       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.


       webcollage accepts the following options:

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

               Images are placed on the root window by using one of the xscreensaver-getimage(1),
               chbg(1), xv(1), xli(1), or xloadimage(1) programs (whichever is available.)

       -window-id id
               Draw to the indicated  window  instead;  this  only  works  if  the  xscreensaver-
               getimage(1) program is installed.

       -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

       -size WxH
               Normally, the output image will be made to be the size of the  screen  (or  target
               window.)  This lets you specify the desired size.

       -opacity ratio
               How  transparently  to  paste  the  images  together, with 0.0 meaning "completely
               transparent" and 1.0 meaning "opaque."  Default 0.85.  A value of around 0.3  will
               produce an interestingly blurry image after a while.

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

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

       -imagemap filename-base
               If  this option is specified, then instead of writing an image to the root window,
               two files will be created: "base.html" and  "base.jpg".   The  JPEG  will  be  the
               collage;  the  HTML file will include that image, and an image-map making the sub-
               images  be  linked  to  the  pages  on  which   they   were   found   (just   like

       -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
               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.

               Note  that  by  default,  webcollage  searches  for images using several different
               methods, not  all  of  which  involve  dictionary  words,  so  using  a  "topical"
               dictionary file will not, in itself, be as effective as you might be hoping.

       -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.

       -directory dir
               Instead of searching the web for images, use the contents of the given directory.

       -fps    Display the current frame rate and CPU load (MacOS only).


       DISPLAY to get the default host and display number.

               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.


       /usr/dict/words, /usr/share/lib/dict/words, or /usr/share/dict/words to  find  the  random
       words to feed to certain search engines.

 , and
  to find random web pages.


       The  Internet being what it is, absolutely anything might show up in the collage including
       -- quite possibly -- pornography, or even nudity.


       Animating GIFs are not supported: only the first frame will be used.


       The  latest  version  of  webcollage  can  be  found  as  a  part  of   xscreensaver,   at,      or      on      the      WebCollage     page     at



       X(1), xscreensaver(1), xli(1), xv(1), xloadimage(1), ppmmake(1), giftopnm(1), pnmpaste(1),
       pnmscale(1),   djpeg(1),  cjpeg(1),  xdpyinfo(1),  perl(1),  vidwhacker(6x),  dadadodo(1),
       driftnet(1) EtherPEG, EtherPeek


       Copyright © 1998-2005 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 <>, 24-May-1998.