Font sizing issues with JTextPane

Hello all,
I have a question which I hope won't be too difficult. Here is some background. I have created both a swing application that is a text editor. The user can cut, copy, and paste text. The user can also change the "font style" and "font size" through a series of combo boxes. When the application is launched there are 2 user inputs which indicate the size of the JTextPane area. For example, the user would type in: >java texteditor 2.5 3.0
and the editor launches with a JTEXTPANE width of 2.5 inches and height of 3.0 inches. This is to be a WYSIWYG type editor which will eventually print what is contained in the JTextPane.
Finally my question. When the user decides to change the font size, I have noticed that the font size does not appear to be the correct size as compared to a MS Word Font Size. For example, I type a phrase in MS Word and set the font size to be 12, and I type the same phrase in my JTextPane to be 12, the text in the JTextPane is much smaller. I actually have to set the font size to be 16 in the JTextPane to match the MS Word Font size. I have used many differnt fonts and in every single case the in JTextPane I have to add 4 to the font size to make it match the font size of the same phrase in MS Word. Does anyone have any idea what is going on here? Does Java (I am using JDK118, it's REQUIRED on my part and swing 111) have it's own font rendering engine that is different than what I see in MS Word? Why would 2 fonts, 1 in MS Word and another in a JTextPane, appear differently? The JTextPane is always 4 too small. I can compenstate for this by adding 4 but that does not tell me why it is happening.
joberoni

Thanks for your response Eric. I have made sure that the view I am looking at in Java is in fact 100%. I realize what represents, for example, 3 inches in ms word according to thier "rulers" does not actually represent 3 inches. That actually depends on the screen resolution and pisels per inch. And while I realize that the font I see on the screen is not the same font that is printed, I still expect to see in Java and in ms word, 2 fonts b appear to be the same size if both are being rendered at 100%. I even did the same experiment in Notepad which and a paint program and I get the same result. I can't help but think if I define a 3 inch area in any program, be it any word processor or graphics program, that the font sizes for a given font should appear the same size. And while the printed font is something completly different, I still still don't understand why the screen fonts appear in a smaller size in a Java JtextPane and probably other controls as well. I just don't get it.
joberoni

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