Made a regrade using HDTV as source; why? Because, even if it has lower quality than BD, it has bigger frame size in the first part of the movie; it could also be used just for the first part, where the frame size is bigger, though…
Comparison: HDTV (DVD colors), BD 2009, regrade
Comparison of the whole movie:
https://diff.pics/kaa5w6EoYgZd/1
Comparisons between DVD 1999, 2005, BD 2009, 2014, regrade:
https://diff.pics/kxPnQW0PKalt/6
https://diff.pics/paTcryjaGp7J/5
https://diff.pics/FDaVXiogt6oz/1
(original DVD/BD images found here: http://www.theraffon.net/~spookcentral/gb1_homevid_compare.htm)