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Manual Reference Pages  -  GETX11 (1)


getx11 - get RLE images to an X11 display


See Also


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 ... ]


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 behavior 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-processed 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 number 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.


-= 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. Defaults 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 image, 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 adjusted 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 display_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 generating program, for example (common usage is "tail -f image.rle | getx11"). Images read directly from files are only updated after 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 input 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), staticcolor(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 intensity.
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 beginning.
All continuing movie action can be halted by pressing a key or mouse button.


urt(1), RLE(5).


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, magnification, info)


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.

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1 GETX11 (1) Jan 28, 1990

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