Information Window Controls

The Information window (often referred to as the Info window) allows one to see and change the selected point in the model and the current image point. It contains menus for opening other windows and dialogs and performing modeling functions. It has controls to set the brightness and contrast of the display, and a pane at the bottom where text output appears.

Toolbar buttons

The top line of the window has some tool buttons and also shows the name of the model file being edited. The buttons here are as follows:

Current Model and Image Point Selectors

The spin boxes on the left show the current model object, contour, and point. As with all spin boxes, you can change a value either by typing a new value in the box or by pressing the up or down arrows. All three of these spin boxes wrap around to the highest value when they are at 0 and you press the down arrow, or from the highest value back to 0 when you press the up arrow. The contour box shows "--x--" when there is no current contour selected, or no contours in a new object. Similarly, the point box shows "--x--" when there is no current point or no points in a contour, or it is blank when there is no current contour. The numbers of objects, contours in the current object, and points in the current contour appear to the right of these boxes.

The spin boxes on the right show the position of the current image point. In Movie mode, this position is always shown with a cross. In Model mode, the position is shown with a cross only if there is no current model point. Modeling usually leaves this position at that of the current model point. You can change the position in the spin boxes; changing Z will change the section that image windows display.

Contrast Controls

The Black and White sliders control the placement of an intensity ramp that is used to scale the image data stored in the program. Ordinarily, these data are stored as bytes with values ranging from 0 to 255. Values below the Black setting are displayed as black on the screen; values above the White setting are displayed as white; and the contrast is stretched for the values in between so that they occupy the full range from black to white. Thus, moving the sliders closer together increases contrast; moving them both to the left or right increases or decreases brightness, respectively.

Two additional sliders, Low and High, appear when data are stored in the program as 16-bit values instead, which can be done by starting the program with the -I 1 option or with a setting in the Behavior tab of the Preferences dialog. These sliders control an initial scaling of the data from their stored values into the range from 0 to 255, after which the Black and White sliders control the usual scaling from that range to the displayed values on the screen. Values below the Low setting are truncated at zero and values above the High setting are truncated at 255. This arrangement allows a very small subset of the intensity range to be examined with a reasonable number of gray levels. The number of displayed gray levels is no longer restricted to the range between Black and White sliders. Although the stored 16-bit values range from 0 to 65535, the numbers to the right of these sliders are scaled to show the original intensity values in the file. Setting the sliders to particular values has the same effect as using the same values with the -s scaling option when loading data into the program as bytes.

The bottom row of controls govern the automatic scaling of contrast.

Movie and Model Mode

The radio buttons select whether the program is in movieing or modeling mode. The main difference between these modes is the behavior of the mouse buttons; they either start and stop movieing through the slices, or perform modeling functions. In addition, some of the modeling functions available through menus and hot keys do not work in Movie mode, but many other modeling functions can be performed.

Information Pane

Messages from the program are printed in the pane at the bottom. Error and warning messages will be printed in color. You can also edit in this window, typing text in, deleting it, and using Ctrl-C to copy text to paste elsewhere.

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