Height = CM instead of Pixels

Hey there, I'm using code to print out a document which is a CD Cover, now I've found that the code I'm using is basically working off Pixel dimensions which I can't afford to use, I'm wanting to use 12.1cm like so.

Code:

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            Dim rect As RectangleF
            rect = e.Graphics.VisibleClipBounds()
            rect.Height = 12.1
            rect.Width = 12.1

---

But obviously you can tell what it's gonna do, it prints a tiny square of it :). Now does anybody know how to make it so I can use CM instead of Pixel dimensions, I'd give it a shot but I'm crap at coding math, I figured I might give this a go

Code:

---

12.1 * 567

---

But sadly, that printed one huge image of it and I didn't want that. So does anybody know how to use Cm's instead of Pixels?

Thank you.

Converting Pixels to CM is no easy task. You have to take into account your screen resolution. Look at this (like 3rd Google research after searching for "Converting PX to CM": http://www.experts-exchange.com/Prog..._21588717.html