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See the Display and Image analysis chapters of Getting Results for a detailed discussion on display and image analysis tools and the options available. A brief orientation on the use of the viewer a key element in image analysis, is given below. The viewer is described in detail in the chapter on Display of Data while the 'Adjust' options to taylor the image display parameters are described at Adjust.
The Viewer
To start the viewer type:
include 'viewer.g' dv.gui();
The viewer Data Manager and Display Panel GUIs will appear. Using the Data Manager, left-click on an image you would like to see in the Display Panel and choose the display type (e.g. Raster Image, Contour Map). The image will be loaded into the Display Panel. You can load as many images and display types as you want.
To zoom in on a region, left-click on the zoom button (magnifying glass icon) in the upper left of the Viewer display, use the left mouse button to make a region, double-left-click in the region to zoom. To un-zoom, hit the Unzoom button at the bottom of the Display.
Image, axis, and label display options are controlled via the 'Adjustment' panel. Left-click on the Adjust... button to bring up this panel. There are a wide range of options to choose from: e.g. plot the beam, change the color map or stretch of an image, change contour lines, change the line width or color, add or delete labels. Once you have the image the way you like it, you can save the state of the image by left-clicking on the 'Save' button in the 'Adjustment' panel. The display parameters can then be restored later by left-clicking on the 'Restore' button.
To obtain statistics on all or part of an image, left-click on the Tools: ImageAnalysis button at the top of the Viewer Display. An Image Analysis GUI will be created. Left-click on Statistics to show the statistics panel. The Full button will produce statistics on the full image (all planes). The Plane button will produce statistics on only the region being displayed on the Viewer panel. Thus, to estimate the RMS in an image, zoom in on a region that has no emission and left-click on the Statistics panel 'Plane' button.
Use the 'DisplayData: Register' Panel to choose which images you want to register and display together. Use the 'DisplayData: Remove' Panel to delete images from the stack.
To print the image, left-click on the Print button at the bottom of the Viewer Panel. You will get a Canvas Print Manager GUI to specify the output postscript file name or send the image to a local printer. Postscript files will be written to the directory you started AIPS++ in.
Below are image analysis examples that are useful for analyzing the example data sets.