One of the hardest things to understand about desktop publishing is that the size of the image on your screen does not accurately reflect the size of your image when you print it. An image that fills your entire screen might only be a small thumbnail when printed (although this would be an extreme case).
When your image's embedded resolution is higher than the monitor's resolution, the image appears larger on the screen than when printed. Luckily, FotoFinish allows you to view a representation of the actual image size when printed by setting the View menu to View at Output Size. This should give you a good idea about the size of your image if you print it at 100% of its actual size.
Monitor resolution refers to the number of pixels or dots displayed in a given unit length of the monitor. Your monitor’s resolution will depend on the size of your monitor (15 inches, 17 inches) as well as its Screen Area setting (1024 x 768, 800 x 600, etc).
Below is a list of monitor resolutions for some common monitor and screen area settings: