Contouring the displayed image

Sometimes you might wish to plot contours generated from the displayed image, rather than superimposing those from another image. The procedure is very similar.

1. Display the required image.

2. Click on the Image-Analysis button on the menu-bar along the top of the main window and choose the Contouring... item, as before. A window similar to Figure  should appear.

3. Do not click on the Choose file... button to specify the image to be contoured. Rather, proceed immediately to specifying and generating the contour levels by clicking on the Generate button and then proceed as before.