The Calibrate tool allows Revu to determine a PDF's scale, enabling accurate measurements.
Calibrating a PDF usually entails a single scale for all measurements. To calibrate separate X and Y scales, see Calibrating Separate X and Y Scales below.
To calibrate a PDF:
Go to Measure > Calibrate. The Calibrate tool opens.
Enter the distance that the line between these two points represents on the drawing and select the units in which measurements are to be reported.
Note: If you are working with a vector-based drawing (as opposed to a scanned PDF), you can enable Snap to Content which makes the cursor snap to the underlying lines and drawing elements, making it much easier to accurately select the two points.
Alternatively, if you already know the PDF's scale, you can enter it in the Scale section of the Measurements tab.
Using the Calibrate tool is recommended, however, as sometimes scaling occurs during the PDF creation process.
PDF can be calibrated with separate X and Y scales. To do so:
Select Separate Vertical Scale. Separate scales appear for both X and Y.
Enter the distance that the line between these two points represents on the drawing and select the units in which measurements are to be reported.
Scale values can be entered directly also. Using the Calibrate tool is recommended, however, as sometimes scaling occurs during the PDF creation process.
If Separate Vertical Scale is unchecked later, the scale set for the X Scale will automatically be used for both X and Y scales. However, existing measurements will not be affected unless Recalculate is clicked.