Provided by: xscreensaver-screensaver-webcollage_5.15-2ubuntu1_i386 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

       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 file.

       -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

       -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 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.

               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

       -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


       Jamie Zawinski <>, 24-May-1998.