HIRES ds9 primer

These instructions describ how to carry out basic image analysis operations with ds9. Note the following semantics:

• "Click on" means to click the mouse on one of the buttons appearing right above the image display.
• "Select" means to use the menus at the top of the window.

Creating Vector Cuts
Create a vector cut	Click on "Region" Click on "more..." Click on "Proj" Click and drag with LEFT mouse button Plot window appears
Move a vector cut	Click on the vector to select Put cursor on the vector (cursor should change to ) Click and drag with LEFT mouse Plot updates automatically
Change length of a vector cut	Click on the vector to select Put cursor on an ENDpoint (cursor should change to ) Click and drag with LEFT mouse Plot updates automatically
Change width of a vector cut	Click on the vector to select Put cursor on the MIDpoint (cursor should change to ) Click and drag with LEFT mouse (NOTE: you can only expand width in one direction, and the direction depends on which direction you dragged to define the vector) Plot updates automatically
Apply an existing vector cut area to a new image	Define a vector as described above Click on "Region", then "save" to get "Save As" popup Enter a filename (or accept default) and click "OK" Load (or wait for) new image Click on "Region", then "load" to get "Open" popup Enter a filename (or accept default) and click OK; region appears on image Point cursor to region and double click; popup plot window appears
Image Statistics
Measure centroid/size	Select "Analysis" from top menu Select "Simple Stats" to get "stats" popup window Click and drag with LEFT mouse on image to define a statistics box Click on "(re)Compute Centroid" box in "stats" popup For greater accuracy, click on "snap to Centroid", then "(re)Compute Centroid" Statistics shown include min, max, sigma, center