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imgdisplay
July 1, 2008
Abstract
Wrapper task controlling the display of images with Ds9/SAOtng
1 Instruments/Modes
not applicable
2 Use
pipeline processing no
interactive analysis yes
3 Description
imgdisplay is a simple wrapper task around the image display program(s) Ds9/SAOtng which allows
the user to control the program from the command line. In more detail, the user can:
1. Launch a new Ds9/SAOtng process
2. Terminate a running Ds9/SAOtng process
3. Load an image into a running Ds9/SAOtng process
4. Flip a displayed image around X and/or Y
5. Read region selections from a running Ds9/SAOtng
All operations are triggered via corresponding task parameters (see Sect. 4). If multiple operations are
specied, the execution order follows the given sequence of task parameters below (see Sect. 4). Example:
imgdisplay startviewer=true viewer=ds9 withimagefile=true imagefile=freadface.fits
flipx=true stopviewer=true
This launches a new Ds9 process (or connects to an already running process), displays the FITS image
fredface.fits, ips it around the X-axis, and nally terminates the Ds9 process.
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4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
startviewer no boolean true falsejtrue
If startviewer is set to true imgdisplay attempts to establish a communication link between itself
and an active Ds9/SAOtng process upon invocation. If a Ds9/SAOtng is active already, either started
manually or through a previous invocation of imgdisplay with stopviewer=false, its main window must
have the title 1 ds9 or ds9-username for imgdisplay to be able to connect to it. username is the value
of the environment variable LOGNAME which is usually the user's login name. If no running Ds9/SAOtng
could be found imgdisplay spawns one with the window title SAOtng-username such that subsequent
task invocations can nd and connect to this process. Please note: Ds9/SAOtng are big programs, even
on modern workstations is can take up to several seconds before the main window appears on the screen.
startviewer=true is a prerequisite that any given additional commands can succeed. If set to \false"
the task exits immediately | all following commands are ignored in this case.
withimagele no boolean false falsejtrue
A boolean switch determining whether a new image should be loaded into Ds9/SAOtng. If set to \true"
the name of the image data set must be given via the parameter imagefile. When a new image is loaded
any previously displayed one is lost.
imagele no string name of existing image
data set
The name of the image data set to load into Ds9/SAOtng when withimagefile is set to \true".
withregion no boolean false falsejtrue
A boolean switch determining whether region specications should be read from Ds9/SAOtng and stored
in the regions parameter. Not applicable to interactive usage.
regions no string
list
This serves as an output parameter to hold region specications read from Ds9/SAOtng when requested
with. Not applicable to interactive usage. withregion=true.
withregiontable no boolean false falsejtrue
A boolean switch determining whether the contents of an CXC-region le[1] should be displayed in the
form of markers on top of the currently displayed image. If set to true, the below parameter regiontable
must be given the name of the region table.
1 Please note: When launching Ds9/SAOtng the main window's title can be set via the title-command line parameter,
e.g. ds9 -title ds9-fred
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regiontable no string name of existing CXC-
region table
The name of the CXC-region table[1] to be visualized.
ipx no boolean false falsejtrue
A boolean switch determining whether the image currently displayed in Ds9/SAOtng should be ipped
around the X-axis.
ipy no boolean false falsejtrue
A boolean switch determining whether the image currently displayed in Ds9/SAOtng should be ipped
around the Y-axis.
viewer no string ENV or name of viewer
executable
A string determining which image viewer shall be used: SAOtng or Ds9. viewer can also be assigned
the value ENV in which case the environment variable
SAS IMAGEVIEWER
must specify either of the two supported programs. Please note: If viewer is just given the name of the
viewer executable it must be reachable via the PATH environment variable. However, viewer may also
contain the full path to the executable, e.g. /usr/local/bin/ds9.
stopviewer no boolean false falsejtrue
A boolean switch determining whether a running Ds9/SAOtng process should be terminated.
withcommands no boolean false falsejtrue
Controlling boolean switch for commands parameter.
commands no list of
strings
list of valid
Ds9/SAOtng com-
mands
If withcommands is set to true the value is supposed to be list of Ds9/SAOtng commands that are to be
send to an already spawned image displayer. E.g. withcommands=true commands="zoom to 2" will set
the zoom factor in the currently displayed image to 2.
withreceive no boolean false falsejtrue
Controlling boolean switch for receive parameter.
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receive no list of
strings
This is an output parameter which is only useful in the context of metatask programming. If withreceive
is set to true output from a running Ds9/SAOtng process (resulting from a preceding execution of com-
mands via withcommands/commands) shall be collected in this parameter as a list of strings. The param-
eter is not accessible as part of imgdisplay's parameter dialog.
5 Errors
This section documents warnings and errors generated by this task (if any). Note that warnings and
errors can also be generated in the SAS infrastructure libraries, in which case they would not be docu-
mented here. Refer to the index of all errors and warnings available in the HTML version of the SAS
documentation.
(fatal)
Ds9/SAOtng cannot be spawned because it is either not installed on the system or inacces-
sible via the PATH environment variable
6 Comments
 imgdisplay is mainly intended to be called from xmmselect but is useful for direct usage
as well
7 Future developments
Future version will:
 oer more Ds9/SAOtng control features, e.g. selection of color tables, zooming, frame
switching etc.
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References
[1] J. McDowell and A. Rots. FITS REGION Binary Table Design. Technical Re-
port ASC-FITS-REGION-1.0, Chandra Science Center, March 1998. Found at the URL:
http://hea-www.harvard.edu/jcm/asc/docs/asc/region.ps.
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