What is the difference between an uncropped painting and a cropped painting?

The BillionDollarArtGallery provides two directories of paintings:

1. Uncropped paintings show the full painting, but they may have black bars on the top of bottom. This is because painters were not painting for the exact shape of modern TVs.
2. Cropped paintings fill the full screen by cropping the painting to the same shape as the TV. Cropped paintings do NOT show the full painting because the full painting would be heavily distorted to fill the screen. 

These two directories are separate collections, though some paintings are included in both collections. For example, The Sea of Ice is a wide painting (called "landscape" as opposed to a "portrait" shape) that lends itself to widescreen cropping. You can see the difference between the original painting and the painting that has been cropped to fill the screen.