|- Hubble Diagram|
|- Spectral Types|
|- H-R Diagram|
|- Sky Surveys|
|- Image Processing|
|Games and Contests|
|Links to Others|
|What is an Image?|
|- 3-D Views|
Alternate Views of Images
Another interesting way to view an image is through the use of isophotes. Isophotes are lines drawn through areas of constant brightness. Isophote images are very similar to contour maps, which show lines through areas of constant elevation.
Click on View and then Isophotes. The following window will appear:
X-Dim and Y-Dim are the size of the picture. High and low are the highest intensity and lowest intensity for which you want isophotes drawn. Step is how far in between isophotes. For the values shown above, Iris will draw isophotes where the intensity is 100, 200, 300, 400, 500, etc, up to 32,700. It is important to choose these numbers wisely.
Another way to view an image is with a 3-D view - a 3-D picture where the height represents the brightness of each pixel. Below you can see a 3-D view of two stars.
The dialog box for 3D view is shown below.
X Dim and Y Dim are the size of the picture and will usually not need to be changed. High and Low are the counts of the brightest and dimmest pixel you want to observe. Azimuth and elevation determine the viewing angle of the plot. Step is the size of the bins, in pixels, on the x and y axis used to make the 3-D graph. A smaller step size will give you a smoother, more detailed graph, but the graph will take longer to make.