Window Number (0...15)specifies the window in which to display the image. When you select the default value of ?1, this VI uses a modal dialog window, centered in the screen. When you select a regular NI Vision window number (0?15), the VI displays Image In in the specified window and temporarily sets the NI Vision window to modal mode. When the user clicks OK or Cancel in the window, the attributes of the window are set back to their initial values.

Image In is a reference to the image on which the user selects the Annulus.

Prompt specifies a message string to display in the title bar of the window. Use this control to provide the user with instructions about selecting the object.

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

Color Palette is used to apply a color palette to the image window. Color Palette is an array of clusters constructed by the user or supplied by the IMAQ GetPalette VI. This palette is composed of 256 elements for each of the three color planes (red, green, and blue). A specific color is the result of applying a value between 0 and 255 to each of the three color planes. If the three planes have identical values, a gray level is obtained (0 specifies black and 255 specifies white). If the image type requires a color palette and it is not supplied, a grayscale color palette is generated and written.

Tip  For best results, set your video adapter to high color or true color.

	Red is the value of the red color plane.
	Green is the value of the green color plane.
	Blue is the value of the blue color plane.

Image Out (duplicate) is a reference to Image In. This VI does not modify the image connected to the Image In input.

Annulus specifies the coordinates of the annulus chosen by the user.

	Center X specifies the x-coordinate of the center of the circle or annulus.
	Center Y specifies the y-coordinate of the center of the circle or annulus.
	Inner Radius is the radius (in pixels) of the inner circle defining one edge of the circular strip.
	Outer Radius is the radius (in pixels) of the outer circle defining the second edge of the circular strip.
	Start Angle is the first angle of the circular strip. The angle is measured counterclockwise from the x-axis of a coordinate system centered on the center of the circle or annulus.
	End Angle is the second angle of the circular strip. The angle is measured counterclockwise from the x-axis of a coordinate system centered on the center of the circle or annulus.

Cancelled returns TRUE if the user ends the selection by clicking Cancel in the window.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.