Well, the comparison of BD vs DVD color timing of Raiders bears a striking resemblance to the comparison of DVD/BD vs OOT color timing of Star Wars, so my guess would be that the DVD of Raiders fell victim to the same trend of giving old movies a more modern look; except unlike Lucas, Spielberg came back to his senses when it came time for the BD release. This is only supported by Spielberg's recent comments about regretting altering his films and his decision to release only the theatrical version of E.T. on BD.