Examining images from a scanner.

The following three images were scanned and saved as a .jpg file, and saved using a high quality, .jpg compression.  The only change is the resolution.  Can you see any difference between the images?  Notice the file size of each file.

bridge75     75 dpi   (  28 Kb)
bridge150     150 dpi    (85 Kb)
bridge300   300 dpi   (273 Kb)
This file is the bridge75 image save as a jpg using a low quality .jpg compression
bridge75med   (11Kb)