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How to convert captured and printed PCB (Printed Circuit Board) from the picture to real one with true dimensions?

I got a picture with PCB that is in the attachment. I don't know the true size(dimensions)  of that PCB. But I know the spacing between the pins of the microcontroller that is installed on that PCB. How can I get a true dimension of that PCB to have it printed on the paper? The details about device I'd like to make at http://www.coolish.ru/nixie and the Printed Circuit Board at http://www.coolish.ru/nixie/kicad_3.PNG (just in case). May be you know some software that can measure the distance between the various parts of the graphic objects in real time, while I am moving cursor over them(the mouse over PCB on vertical and horizontal in my case).
Here is the algorithm I am following to reach my goal:
1) I am taking a snapshot of picture with PCB with Ashampoo Snap
2) Pasting that snapshot in Word
3) Printing out that snapshot
4) Getting the real distance between the holes of PCB by measuring the spacing between the pins of purchased microcontroller
5) Calculating the scaling factor K=Ptrue/P, where Ptrue-the real spacing between the holes on PCB; P-the measured spacing between the holes on the PCB printed at step 3)  
6) Working on my graphic object (snapshot of PCB), by stretching it out/squashing on horizontal, to get the real distance between left and right edges of PCB, so that Dtrue=D*K, where Dtrue-real distance between left and right edges of PCB; D-measured distance on horizontal of printed PCB at step 3), saving the proportions between the tracks and holes of PCB (this feature is built-in to Word and ticked by default)
Hereby I have a problem at step 6), because I can't determine the distance between left and right edges of the PCB in mm. The top ruler in Microsoft Word is very rude for my purpose. So, how to measure that D in mm, so as to set the required Dtrue in mm in Word?
1 Solution
Use Irfanview http://www.irfanview.com/

It is a graphics viewer which is free for use.

Paste the graphics concerned into Irfanview and drag your mouse between the two points you want to measure.  You'll get a measurement in pixels appearing in the title bar.

You can use that to measure the width and height of the PCB and also to measure the distance between two holes that you know the actual measurement of (I think this is where the microcontroller is).

So you'll have

Microcontroller hole width in pixels/Microcontroller hole actual width = PCB width in pixels/PCB actual width

You should know the first three and you can then solve for the fourth.
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