Calibrate 
Use
You need to calibrate when measuring and dimensioning lines and radii. This function is only used with files in pixel format (such as *.BMP, *TIF) because files in the vector format (such as *.DWG for AutoCAD) are already calibrated You can, for example , make a measurement of length for 10 centimeters (3.9 inches). For all further measurements there is a conversion according to the scale.
The Calibrate operation is dependent on how you carry out measurements :
- Calibrate, when you do not save the measurement
- Calibrate, when you save the measurement
Calibrate, when you save the measurement
You display the original application file with the integrated viewer. In the viewer function bar you selected Tools → Dimensioning. The measurement procedure is set to Pixel.
See also: Dimensioning 2D files
- Select Calibrate.
- Highlight the length that you want to use for all measurements as a point of reference:
- Position the cursor on the beginning point of the line and click the left-hand mouse button.
- Pull the cursor to the end point of the line. The line then appears. Click the left-hand mouse button.
The Calibration dialog box appears automatically.
- Enter the Distance and the Unit of measure (for example 10 centimeters).
Confirm with 
.
- Select the measurement function (Line- or Radius measurement).
Calibrate, when you save the measurement
You are processing a layer. The screen section of the viewer displays the Redlining function bar.
See also: Dimensioning 2D files
- In the Redlining function bar select Settings → Extras.
- In the data group Measurement functions select Calibrate.
Confirm with 
. The Redlining function bar is active again.
- Highlight the length that you want to use for all measurements as a point of reference.
The remainder of the operation is the same as in Calibrate, when you do not save the measurement.