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GETX11(1)		    General Commands Manual		     GETX11(1)

NAME
       getx11 -	get RLE	images to an X11 display

SYNOPSIS
       getx11  [ -= window_geometry ] [	-a ] [ -d display ] [ -D ] [ -f	] [ -g
	      display_gamma  ]	[  -{iI}  image_gamma  ]  [  -j	 ]  [	-m   [
	      maxframes/sec  ]	]  [  -n levels	] [ -s ] [ -t title ] [	-v ] [
	      -{wW} ] [	-x visualtype ]	[ infile ...  ]

DESCRIPTION
       This program displays an	RLE(5) file on an  X11	display.   It  uses  a
       dithering  technique  to	take a full-color or gray scale	image into the
       limited number of colors	typically available under X.  Its default  be-
       havior  is to try to display the	image in color with as many brightness
       levels as possible (except on a one bit deep display).  Several	getx11
       processes  running  simultaneously  with	the same color resolution will
       share color map entries.

       Getx11 uses the standard	X window creation procedure to create a	window
       with  a	location  and size specified by	the user, with the restriction
       that the	window must be at least	as large as the	input image.   If  the
       window  is  turned into an icon,	a smaller version of the image will be
       displayed in the	icon.

       If the input image has only a single channel, and has a color map, then
       this  color  map	will be	loaded directly	(if possible) instead of using
       the normal dithering process.  Many images will look better if pre-pro-
       cessed  by mcut(1) or rlequant(1), both of which	produce	images reduced
       to a single channel with	a colormap.  This is because the  colors  that
       are used	to display the image are chosen	to be a	good set of colors for
       that particular image, rather than a set	of colors  that	 are  mediocre
       for all images.	The color map so created will not be shared with other
       windows.	 The picture comment colormap_length specifies the exact  num-
       ber of useful entries in	the input color	map.  If this is significantly
       less than 256, this can save space in the shared	X color	map.

OPTIONS
       -= window_geometry
	      Specify the geometry of the window in which the  image  will  be
	      displayed.  This is useful mostly	for giving the location	of the
	      window, as the size of the window	will be	at least as  large  as
	      the size of the image.

       -a     "As is", suppress	dithering.

       -d display
	      Give  the	 name  of  the X display to display the	image on.  De-
	      faults to	the value of the environment variable DISPLAY.

       -D     "Debug mode".  The operations in the input RLE(5)	file  will  be
	      printed as they are read.

       -f     "No  fork."  Normally, getx11 will fork itself after putting the
	      image on the screen, so that the parent process may  return  the
	      shell, leaving an	"invisible" child to keep the image refreshed.
	      If -f is specified, getx11 will not exit to the shell until  the
	      image is removed.

       -g display_gamma
	      Specify  the  gamma of the X display monitor.  The default value
	      is 2.5, suitable for most	color TV monitors (this	is  the	 gamma
	      value assumed by the NTSC	video standard).

       -i image_gamma
	      Specify  the  gamma (contrast) of	the image.  A low contrast im-
	      age, suited for direct display without compensation  on  a  high
	      contrast	monitor	 (as  most  monitors are) will have a gamma of
	      less than	one.  The default image	gamma is 1.0.  Image gamma may
	      also  be	specified  by a	picture	comment	in the RLE (5) file of
	      the form image_gamma=gamma.   The	 command  line	argument  will
	      override	the  value  in	the  file if specified.	 The dithering
	      process assumes that the incoming	 image	has  a	gamma  of  1.0
	      (i.e.,  a	200 in the input represents an intensity twice that of
	      a	100.)  If this is not the case,	the input values must  be  ad-
	      justed before dithering.

       -I image_gamma
	      An  alternate  method  of	specifying the image gamma, the	number
	      following	-I is the gamma	of the display for which the image was
	      originally  computed (and	is therefore 1.0 divided by the	actual
	      gamma of the image).  Image display gamma	may also be  specified
	      by  a  picture  comment  in  the	RLE  (5) file of the form dis-
	      play_gamma=gamma.	 The command line argument will	 override  the
	      value in the file	if specified.

       -j     "Jump  mode".   When  reading  an	image from the standard	input,
	      each scan	line is	normally displayed as  soon  as	 it  is	 read.
	      This  allows a user to monitor the progress of an	image generat-
	      ing program, for example (common usage is	"tail -f  image.rle  |
	      getx11").	  Images read directly from files are only updated af-
	      ter every	10 lines are read to improve the display speed.	  This
	      behavior can be forced for the standard input by specifying jump
	      mode.

       -m [ maxframes/sec ]
	      "Movie mode."  Optional argument is maximum rate at which	movies
	      will play, in frames per second.

       -n levels
	      Specify  the  number  of	gray or	color levels to	be used	in the
	      dithering	process.  If  not  this	 many  levels  are  available,
	      getx11  will  try	 successively fewer levels until it is able to
	      allocate enough color map	entries.

       -s     "Stingy mode".  Normally,	getx11 allocates an  X	server	pixmap
	      for  each	 image to speed	up the window refresh.	If many	images
	      are displayed, the server	may run	out of memory to  store	 these
	      pixmaps (or its virtual memory size may get very large).	Stingy
	      mode suppresses pixmap allocation	(except	in movie  mode,	 where
	      the pixmaps are necessary	for reasonable performance).

       -t title
	      The  window name for an image window normally comes from the in-
	      put file name or a image_title=title comment in  the  RLE	 file.
	      The  window  name	can be forced to a particular string with this
	      option.

       -v     Verbose.	(But less so than with -D.)

       -w     This flag	forces getx11 to  produce  a  gray  scale  (black-and-
	      white)  dithered	image  instead	of a color image.  Color input
	      will be transformed to black and white via the NTSC Y transform.
	      On  a  low color resolution display (a display with only 4 bits,
	      for example), this will produce a	much  smoother	looking	 image
	      than  color dithering.  It may be	used in	conjunction with -n to
	      produce an image with a specified	number of gray levels.

       -W     This flag	forces getx11 to display the image as a	bitonal	 black
	      and  white  bitmap  image.   This	 is the	only mode available on
	      monochrome (non gray scale) displays (and	is the default there).
	      Black  pixels  will  be displayed	using the BlackPixel(3X) value
	      and white	with the WhitePixel(3X)	value (note that these may not
	      be  black	 and white on certain displays,	or when	they have been
	      modified by the user.)

       -x visual_type
	      Specify X	visual type to be used.	 The value may be a string  or
	      a	number.	 This number is	assumed	to be an integer between 0 and
	      5, denoting  staticgray(0),grayscale(1),	pseudocolor(2),static-
	      color(3),	 truecolor(4),	or  directcolor(5).   The  string must
	      match one	of these visual	types (any capitalization is ignored).

       infile ...
	      Name(s) of the RLE(5) file(s) to display.	 If not	specified, the
	      image  will be read from the standard input.  In movie mode, you
	      get one window, and zooming is disabled.	In  normal  mode,  you
	      get one window per image.

Mouse/key actions (normal mode)
       Mouse 1 (left):	   Increase zoom factor	by 1, center on	this pixel.

       Mouse 2 (middle):   Recenter on this pixel.

       Mouse 3 (right):	   Decrease zoom factor	by 1, center on	this pixel.

       Shift mouse 1:	   Show	 value	at this	pixel.	In B&W,	just shows in-
			   tensity.

       Shift mouse 2:	   Toggle between zoomed and unzoomed.

       q,Q,^C:		   Quit.

       1,2,3,4,5,6,7,8,9:  Set zoom factor.

       Arrow keys:	   Move	image (when zoomed).  Shifted moves faster.

Mouse/key actions (movie mode)
       Mouse 1:		   Run movie forward.

       Shift Mouse 1:	   Run movie continuously in current direction.

       Mouse 2:		   Step	movie one frame	in current direction.

       Shift Mouse 2:	   Set movie speed by moving mouse  "up"  and  "down".
			   The	speed  chosen  is displayed in the upper right
			   corner of the window.

       Mouse 3:		   Run movie backward.

       space:		   Flip	one frame in current direction.

       b:		   "Bounce" image - run	it continuously	forwards, then
			   backwards, then forwards, ...

       c,C:		   Run	move  continuously.   "c" runs it forward, "C"
			   runs	it  backward.	When  the  movie  reaches  the
			   "end",  it will immediately restart from the	begin-
			   ning.

       All continuing movie action can be halted by pressing a	key  or	 mouse
       button.

SEE ALSO
       urt(1), RLE(5).

AUTHOR
       Spencer W. Thomas, University of	Utah (X10 version)

       Andrew F. Vesper, Digital Equipment Corp. (X11 modifications)

       Martin R. Friedmann, University of Michigan (better X11,	flipbook, mag-
       nification, info)

BUGS
       Display to a 24-bit visual is somewhat optimized, but could be faster.

       Doesn't pay any attention to the	X resource database (i.e.,  cannot  be
       customized  via	the .Xdefaults file).  The options, while standard for
       the raster toolkit, are non-standard for	X.

4th Berkeley Distribution	 Jan 28, 1990			     GETX11(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | Mouse/key actions (normal mode) | Mouse/key actions (movie mode) | SEE ALSO | AUTHOR | BUGS

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