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Unit tool

Button

Use

Use this tool to calibrate your measurements.

Click the Unit tool .
Identify a line in the image of which the length is known, and then click one end of that line.
Click the other end of the line.
Enter the real length and select the unit in the dialog box that appears.
Click the option "Use this as the default calibration" if you want to use this calibration for next images.
Click OK.

The length (in pixels) is displayed in the Measurements list window.

When the option Show result after finalizing measurement is selected, then the length is displayed in a small window next to the object.

After you have defined the unit, all previous measurements are recalculated.

A default calibration can also be defined in the options box.

Example

Calibrate

See also