The example files are images to try Graphic Workshop
out with. 

Example 1 -  two colour image file. This will be
             viewable on any card.

Example 2 -  sixteen colour image file. This will
             be viewable on EGA and VGA cards.

Example 3 -  256 colour image file. This will be
             viewable on VGA cards only.

To really see what dithering can do, print out
example one.