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webcollage(6)		      XScreenSaver manual		 webcollage(6)

NAME
       webcollage - decorate the screen	with random images from	the web

SYNOPSIS
       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]]	[-dic-
       tionary dictionary-file]	[-driftnet [cmd]] [-directory dir] [-fps]

DESCRIPTION
       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 webcol-
       lage-helper program installed (a	GDK/JPEG image compositor),  but  web-
       collage 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.

OPTIONS
       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 win-
	       dow 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  xloadim-
	       age(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.  (Remem-
	       ber 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
	       size.

       -opacity	ratio
	       How  transparently to paste the images together,	with 0.0 mean-
	       ing "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.

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

       -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
	       https://www.jwz.org/webcollage/.)

       -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 std-
	       out.  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 sev-
	       eral different methods, not all	of  which  involve  dictionary
	       words,  so  using  a "topical" dictionary file will not,	in it-
	       self, 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 cau-
	       tion.

       -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).

ENVIRONMENT
       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.

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

	   http://www.altavista.com/image/randomlink,
	   http://random.yahoo.com/fast/ryl,
	   http://www.livejournal.com/stats/latest-img.bml, and
	   http://www.google.com/ to find random web pages.

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

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

UPGRADES
       The  latest  version  of	 webcollage can	be found as a part of xscreen-
       saver, at https://www.jwz.org/xscreensaver/, or on the WebCollage  page
       at https://www.jwz.org/webcollage/.

       DriftNet: http://www.ex-parrot.com/~chris/driftnet/

SEE ALSO
       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(6), dadadodo(1), driftnet(1)	EtherPEG, EtherPeek

COPYRIGHT
       Copyright  (C)  1998-2018  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  no-
       tice 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.

AUTHOR
       Jamie Zawinski <jwz@jwz.org>, 24-May-1998.

X Version 11		      5.44 (20-Mar-2020)		 webcollage(6)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | FILES AND URLS | BOOBIES | BUGS | UPGRADES | SEE ALSO | COPYRIGHT | AUTHOR

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