Although this is only a small part of the other 100 dpi picture it takes up 31.4KB. The advantage is that you are able to see more detail from a zoomed in view. If you try to zoom in on the 100 dpi picture the quality will quickly deteriorate. If the entire 200 dpi picture was here is would be 274KB in size and if not compressed in JPEG format it would be 1874KB which is close to 2 megs.