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#### Drawing lines and measuring linear distances

You can measure linear distances between two points on an image.

Step 1: Select the Distance tool

To select the tool:

| 1. | Click the Annotate icon on the main toolbar.

| 2. | Click the Distance tool on the Annotation Control Panel.

For other ways to select the tool, see Selecting an annotation tool.

Step 2: Adjust the Distance tool properties (if necessary)

For an overview of annotation properties, see Setting the annotation properties.

To adjust the tool properties:

| 1. | Click the Color box, and then specify the color of the annotation.

| 2. | Click the Thickness box, and specify the line width.

| 3. | Click the Font size box, and specify the font size of the measurement.

| 4. | Specify where to place the measurement. The following table describes the available options:

Option | Meaning
Start |
| • | Place the measurement at the beginning of the line.
End |
| • | Place the measurement at the end of the line.

Step 3: Draw the line

To measure a linear distance:

| 1. | Drag the mouse pointer across the image where you want the line to appear.

| 2. | Release the mouse button.

A line with the measurement it represents is displayed on the image.

Note:

| • | Measurements smaller than 10 units are displayed with one decimal precision, for example, 8.7 mm. Measurements equal to or larger than 10 units are rounded off to the nearest integer (plain number). For example, 10.9 mm is expressed as 11 mm.

| • | If the line contains no measurement unit, calibrate the scale. See Calibrating the measurement scale.

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