viewer – View an image or visibility data set – visualization task

Description

The viewer will display images in raster, contour, vector or marker form. Images can be blinked, and movies are available for spectral-line image cubes. For measurement sets, many display and editing options are available.

The viewer can be run outside of casapy by typing <casaviewer>.

Executing viewer <viewer> will bring up a display panel window, which can be resized. If no data file was specified, a Load Data window will also appear. Click on the desired data file and choose the display type; the rendered data should appear on the display panel.

A Data Display Options window will also appear. It has drop-down subsections for related options, most of which are self-explanatory.

The state of the viewer – loaded data and related display options – can be saved in a ‘restore’ file for later use. You can provide the restore filename on the command line or select it from the Load Data window.

See the cookbook for more details on using the viewer.

Parameters

Title

Parameter	Default	Description
infile	''	(Optional) Name of file to visualize.
displaytype	'raster'	(Optional) Type of visual rendering (raster, contour, vector or marker). lel if an lel expression is given for infile (advanced).
channel	int(0)	(Optional) access a specific channel in the image cube
zoom	int(1)	(Optional) zoom in/out by increments
outfile	''	(Optional) name of the output file to generate
outscale	float(1.0)	(Optional) amount to scale output bitmap formats (non-PS, non-PDF)
outdpi	int(300)	(Optional) output DPI for PS/PDF
outformat	'jpg'	(Optional) format of the output e.g. jpg or pdf (this is overridden by the output files extension
outlandscape	False	(Optional) should the output mode be landscape (PS or PDF)
gui	True	(Optional) Display the panel in a GUI.

Parameter Explanations

infile

''

(Optional) Name of file to visualize.

displaytype

'raster'

(Optional) Type of visual rendering (raster, contour, vector or marker). lel if an lel expression is given for infile (advanced).

channel

int(0)

(Optional) access a specific channel in the image cube

zoom

int(1)

(Optional) zoom in/out by increments

outfile

''

(Optional) name of the output file to generate

outscale

float(1.0)

(Optional) amount to scale output bitmap formats (non-PS, non-PDF)

outdpi

int(300)

(Optional) output DPI for PS/PDF

outformat

'jpg'

(Optional) format of the output e.g. jpg or pdf (this is overridden by the output files extension

outlandscape

False

(Optional) should the output mode be landscape (PS or PDF)

gui

True

(Optional) Display the panel in a GUI.