Wasn't sure how to best word the subject but hopefully that will do. For those that know a little about reference quality transfers I was curious about this subject both in terms of general knowledge and a practical reason. Can one approximately say what era movies reach a reference quality release on dvd in that it is reasonable to assume the audio/video quality will not be improved upon unless a new audio track/mix is done? Would it be something like most pre-'90, earlier, etc? The context of the question is in terms of building a library of movies over time if one can lessen the ones that may need/want to be repurchased upon the next generation. Is it also reasonable to assume that most films will be of reference quality given a proper release upon HD-DVD short of ones that were shot using something other than 35mm film or after a general timeline? Anyone here involved in the actual process of transferring movies to DVDs that can provide a little insight into the process and what type of compromises some type of films that are needed for this generation and how the next generation technology will improve on those?