How to Change Picture Resolution for Printing
- 1). Click "Start" > "All Programs" > "Accessories" > "Paint."
- 2). Press "Ctrl"+"O," locate and open your image you want to resize.
- 3). Click "Image" > "Resize." Click "Maintain aspect ratio," then click the "Pixels" button.
- 4). Enter your new horizontal and vertical resolutions in the spaces provided. Click "OK."
- 5). Click "Paint," then "Print" to print the document at your new resolution.
Source...