Annotation Properties and Settings

All annotations that are available are listed in the top section of the Data Properties and Settings panel.

• Click the Annotations icon at the top of the panel to see the available annotations (see Filters for information about filtering the listed items).
• Click the Eye icon on the left side of a listed item to show or hide the annotation in the selected 2D view. Click the 3D icon on the right side of an item to show or hide the annotation in the 3D view of the selected scene. See Object List for more information about changing the visibility of an object.
• Click the Color swatch on the left side of a listed item to open the Color dialog. In this dialog you can choose a new color for the annotation.
• Select an annotation to view related measurements, modify its appearance, and access additional tools (see Annotation Properties and Annotation Measurements).

The properties available for modifying the appearance of the annotation and its control points are described in the following table. The different measurements available for each annotation are also described below.

Annotation Measurements

The measurements shown as part of the annotation properties are dependent on the type of annotation selected, as described below.

See Selecting the Views Preferences for information about choosing a default unit and significant digits for measurements. You can also change the measurement units used in the Scene's Views Properties panel (see 2D Scene's Views Properties for information about changing the default units for the selected scene).

Measurements are displayed in standard units, such as millimeters, square millimeters, or cubed millimeters, and the expected margins of error can vary from device to device. Refer to the documentation from the device manufacturer for information related to their equipment. The accuracy and reproducibility of measurements is dependent on the precision of the user’s operation of the mouse. Keep in mind that working with magnified images when drawing annotations helps reduce margins of error, and working with reduced-magnification images can lead to greater margins of error.

Annotation measurements

	Description
Point Set tool	The native value for each point in the set, along with its coordinates (see Using the Points Tool).
Ruler tool	The distance between two points (see Using the Ruler Tool). Dataset values along the length of a ruler can also be plotted in an intensity profile (see Profiling Intensity).
Angle tools	The angle between two lines (see Using the Angle Tools).
Path tools	The length of the path, as well as the area of a closed path (see Using the Path Tool). Dataset values along the length of a path can also be plotted in an intensity profile (see Profiling Intensity).
Region tools	The area and perimeter of the selected portion of an image (see Using the Region Tools). The minimum, maximum, mean, and standard deviation values of a dataset can also be plotted in histograms (see Viewing Region Histograms).

How to Change the Measurement Unit

If required, your change the length and angle units used for the measurements in the active scene (see Selecting the Views Preferences for information about choosing a default unit and significant digits for measurements).

1. Select the view with the required measurement.
2. Click the Change Unit button in the Scene's Views Properties panel and then choose the required unit in the Length Unit or Angle Unit drop-down menu.

Tools to create intensity profiles for rulers and paths, as well as histograms for regions, are available in the lower section of the panel (see Profiling Intensity and Viewing Region Histograms).