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IMDISPLAY

NAME

imdisplay − generate/display/save composite images interactively

SYNOPSIS

imdisplay FileName_or_TransformOption [ ... ]

DESCRIPTION

imdisplay is a S-Lang / Gtk utility which accepts an arbitrary number of images as input and by default renders them stacked upon one another, respecting transparency. The composite image may be easily tiled or scaled, as well as automatically scrolled for images too large to fit reasonably within your display. Alternatively, the panes option may be used to display each image within its own window, tiled either vertically or horizontally. imdisplay may be used as either a self-contained executable script or as a S-Lang function. When invoked as function (e.g. from the slsh prompt or a S-Lang script) the input images may be specified as either filenames, raw S-Lang arrays, or GdkPixbufs. When invoked from the operating system command line the input images must be filenames. If any input image in a composite contains an alpha channel (transparency) then the rendered result will as well.

imdisplay supports a wide variety of input file formats, including JPEG, PNG, GIF, XPM, TIFF, animations, and (optionally) the FITS file format popular in astronomy. The rendered result may also be saved to a variety of formats, including JPEG, PNG, and FITS. The range of supported formats depends upon how Gtk and SLgtk were compiled.

Optional strings specifying basic transformations may be included within the input arguments. Most of these are performed on the composite image just prior to display, and include:

flip

Mirror the image vertically

flop

Mirror the image horizontally

size=<geometry>

Resize the image; geometry may be either

be a scaling percentage or an absolute

pixel size, such as 150x200% or 100x300;

when only one value is provided it will

be applied to both axes of the

fill=<rule>

How to fill new space created in image display

window when it is enlarged; may be one of

none no fill; keep original image

tile fill with consecutive image copies

scale fill by enlarging image to fit

panes=<layout>

How to display multiple images; layout may be one of

one | single

composite all images into

one window (the default)

horiz[ontal]

tile images horizontally

vert[ical]

tile images vertically

No compositing is performed for horizontal or

or vertical tiling.

At launch all of the windows created by imdisplay will be chained: e.g. the control window will be chained to the window of the last image loaded, meaning that the controller will follow the image window around onscreen when the latter is moved; when the controller is moved its new gravity (i.e. placement relative to the image) will be remembered. An entire vertical (or horizontal) tiling of windows may be moved simply by moving its top- (or left-) most window. To disable chaining, ensure that the slave window you wish to unchain has focus, then hold down the SHIFT key while moving the slave. This will disconnect the slave from its own master, but leave intact any chains in which the slave is itself a master.

AUTHOR

The author of SLgtk and imdisplay is Michael S. Noble <mnoble AT space DOT mit DOT edu>. Rafael Laboissiere <rafael AT debian DOT org> created the SLgtk package for Debian and helped author this man page.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation.

On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL

SEE ALSO

On Debian systems the reference manual for SLgtk can be found at /usr/share/doc/slang-gtk/slgtk.txt.gz. It is also available in HTML, PDF, and text formats on the SLgtk website.

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