I agree with Kayot. They're going to need to pull out all of the stops for this one. Final Fantasy X and X-2 have their own little quirks when you try to run them on emulator. Final Fantasy X occasionally has screwed up textures, and upscaling it results in some slightly screwed up text where you can see a column of pixels or so from the next letter when it tries to upscale the text. Final Fantasy X-2 has some strange issues with cutscenes where you have to mess with the rendering setting while actively playing the game back and forth between what runs the cutscenes properly and what setting runs the actual game the best. As a result, the remastered versions of those games look like they're the best way to play them at this point. (Unless somebody can help me find a script somebody made for camera control in FFX, that would let me overlook the rest of the issues
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You want to play Final Fantasy XII, here's what you do. First, get a hold of the International Version of the game. Next, run the translation patch that changes 100% of the text to English. (I don't know if the cutscenes were originally in English or not, but if they were in Japanese, the patch apparently swaps the audio to the English version.) Next, load the game up in PCSX2 at the highest internal resolution your system can support. If you're hoping for a PC version of the remaster, you should be able to get at least 4x resolution, which is pretty much higher than standard HD. Turn on texture filtering or whatever to smooth out the textures a bit. Finally, add in just the faintest amount of sharpening to the graphics settings, so that the textured engravings on the stone walls in the background look more like actual engravings and not painted onto a flat surface. There's a sweet spot that hits that effect perfectly without hurting how things like character clothing or skin textures look. There you go, an HD version of FF12 with all of the International add-ons, English text, beautiful graphics, and pretty much flawless graphics for things like text and menus. They actually upscale incredibly well.
If they want to do a Final Fantasy XII remaster, they're going to have to do everything they can to out-do what we can already do in an emulator. Otherwise, all of that extra work will be for nothing, and they could pretty much just pay the PCSX2 team for a licensed version of the emulator rigged for only the one game, pay a royalty for the translation patch, and sell it. I mean, that's what Nintendo does for Virtual Console, and doing this for FFXII would honestly look pretty damn good, as well as only take a couple weeks at most to get everything set to release. All they'd really have to do would be to retexture the text to a higher resolution so it looks slightly smoother, and rig the emulator to let them do that.