A stereo pair of flowers at native camera resolution.  Sometimes the edges of an image can appear blurred and DOF can often be an issue.







More image at the native resoultion of the Canon A300:



While native resolution is not as sharp as one might want, it is nice to be able to look at things in the photo more closely if they want.


If an image is saved at too low of a resolution it will pixelate at 120% enlargement.  Obviously, an overly compressed jpg goes blocky rather than pixelate. 

The main purpose of larger images is induce user involvement in viewing.  Viewing is best when detail is revealed on demand.  It is like built in binoculars - as long as we are using a viewing system we may as well have and use a zoom.
Slide shows and movies present the viewer with no choice.  Simply controlling the duration of the display of an image is an improvement over a fixed interval.   Participation in the image viewing process is more like browsing through an image.

If you doubt that image size makes a difference the read the the label on the green striped container in the store window:
http://www.celutek.com/holographics/bodmerc.JPG