Disney re-releases movies every seven to eight years, and with this comes sharper graphics and new promotional artwork for Disney movies. A lot changed between today's DVD and blu-ray covers and the original posters for Disney movies, with extra sheen and gloss added to give these films more of a contemporary look. After all, some of these films came out in the 1940s, so it makes sense their original posters look a little lo-fi compared to animation techniques you see today.
Disney basically set the standard for animated movie posters as it did with animation itself, and these posters definitely show that distinction to be true. Scroll down to see a comparison of original Disney posters to their current DVD covers. As would be expected on list of Disney film posters, some of Disney's best animated films appear on this list.