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2.1. Set scale

First, you need to tell the software how long is one millimetre (or one inch), so that distances can be correctly estimated.

This is rather straightforward -- use a known length on the target, click where the starting point is

and confirm with "ok".

(the starting point turns acid-green)

Then click where the ending point is

and confirm with "ok" (the whole length turns acid-green).

In the scale length input

enter the actual scale length (depending on your measurement system choice -- in mm or in inches), and confirm with "ok". The scale is set now:

The known length does not have to be horizontal (as in this example), it just needs to be known. To establish scale it is better to choose a rather large length (bigger than 10 cm / 4") -- the longer it is, the more precise are the measurements.

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Book | by Dr. Radut