OK lighting is important in visual story telling and the grey lighting in the POA+ films is representing the dark nature of those films. This just isn’t’ the case in the first to films which are meant to be more innocent and adventurous. If anything the later films should be altered slightly as the grey filter is heavy an over used, but still needed. You shouldn’t be adding that to the first two films though, that just shows your (please don’t take this a an insult) naivety, when it comes to the uses of visual effects and atmosphere.
Oh and the removal of all subplot from the movie, also a big no no when it comes to making anything … good. The later films suffered for it (though american audiences still lapped up enough of the fight sequences to make the millions) which can be seen in the increasing dependence on CGI where more time consuming (and there for more expensive) practical effects would have been more suitable. I am not saying CGI is bad, its good when used properly, but it wasn’t in later films. Therefore it is a bit foolish to model your remaster to fit with the shallow (in terms of subplot) moves 3-8.
You really show you lack of understanding when you removed and reduced the muggle section of the story. The entire success of Harry Potter as a franchise can be traced back to J K Rowling’s decision to start with the mundane and build to the magic before ending with drama and tragedy (both the tragedy come mostly in later films). Of course you have decided to remove the magical opening which is good! However, removing is perhaps not the best of ideas as it does serve a crucial part is that ever elusive (to you) over arching subplot. Simply put Hagrid brings harry to No. 4 and Hagrid takes him away.
Never the less I could go on about every single narrow minded point you’ve made about the changes you are making, but your still going to make them. All I can really say is if you are thinking of making a career of film making as I feel that someone with the passion and dedication to make an edit such as this (for all its floors) might, get your head out of the colour by numbers how to make a action flick book, like they have at ‘Hollywood’ ATM. Now good luck I DO I am hope you are pleased with you achivement, but I must leave you with these few words “… Much more, but my hands are tiering”.
P.S. RESCORE!??!?!?! Remove the John Williams score!??!?!?! “Are You Mad?!?!?”