I have scanned a few pages of a technical article from an old book, which contain diagrams and a few lines of text - all in black & white. The scanned files are in jpg (3072 x 3972 pixels) format. But the scanned pages are showing a greyish background, which I want to remove (because I want to include the diagrams in a Word 2003 document, and they would not appear good, and are a complete waste of toner).

I am using WinXP Sp2, and have the following software to handle graphics and photos:
- Microsoft Paint
- Windows Fax Viewer
- Microsoft Office Picture Manager

How can I change the background color to 'plain white' using any one of the above software ?

Appreciate your guidance. You people are a great technical help !