@Alexrd That was me. I only asked because I hadn't seen that shot in that high of quality before and was curious of your source.
Apparently I need to feast my eyes on the blu shot :P
@Valeyard this is a VERY quick and dirty comparison of the Sebulba scene (gimp lanczos3 upscale of GPVOD vs your lossless upscale of the extras dvd)
http://screenshotcomparison.com/comparison/139232
I figure if a rough scaling can put them that close, your scaling script will probably work wonders.