Does a regular DVD look better played on a Blu-ray player?

A blu-ray player will not turn a DVD output into an HD quality signal. However, most will convert the signal to an HD format before sending the signal to a television. The conversion does not add more detail to the image but it can give the impression of a better image compared to watching the same signal output in standard definition. The player will usually have an option to enable the up conversion to HD so it is worth trying it with and without the conversion to see which offers the more pleasing image.