Examples
To simply create a CASA viewer to set up interactively, you can use:
imview
To open a particular image:
imview "ngc5921.clean.image"
To open an image and overlay a contour:
imview "ngc5921.clean.image", "ngc5921.clean.image"
or equivalently:
imview(raster="ngc5921.clean.image", contour="ngc5921.clean.image")
To output an image:
imview(raster="ngc5921.clean.image", out="ngc5921-01.png")
To plot a subset (zoom) of a raster image, noting the notation of curly brackets:
imview(raster="ngc5921.clean.image", out="ngc5921-02.png", zoom={'channel': 10, 'blc': [113,109], 'trc': [141,136]} )
To make an overlay of a raster image (ngc5921.clean.image) with a contour map of the same image (ngc5921.clean.image). Data ranges, the colormap, and the scaling cycles of the raster image are selected. Contours are auto-generated, and the x-axis will be declination. The image is written out to a file named myout.png (in png format).
imview(raster={'file': 'ngc5921.clean.image', 'range': [-0.01,0.03], 'colormap': 'Hot Metal 2', 'scaling': -1}, contour={'file': 'ngc5921.clean.image'}, axes={'x':'Declination'}, zoom={'channel': 7, 'blc': [75,75], 'trc': [175,175], 'coord': 'pixel'}, out='myout.png')
Same as the previous example, but with an integral zoom level and no output to a file:
imview(raster={'file': 'ngc5921.clean.image', 'range': [-0.01,0.03], 'colormap': 'Hot Metal 2'},contour={'file': 'ngc5921.clean.image'}, axes={'x':'Declination'}, zoom=2)
Here, the contour levels are explicitely given, and a region file is used to define the zoom area:
imview(raster={'file': 'ngc5921.clean.image', 'range': [-0.01,0.03], 'colormap': 'Hot Metal 2'}, contour={'file': 'ngc5921.clean.image', 'levels': [-0.2, 0.2, 0.25, 0.3, 0.35, 0.4, 0.6, 0.8] }, zoom='myregion.rgn')
Specifying zoom={'file': 'myregion.rgn', 'channel': 10} would result in the same level of zoom and would display channel number 10 from the cube.