I've been experimenting with some image upscalers, and was able to convert the KH2 opening sequence into 4k! Aside from doubling the resolution, it also adds clarity by smartly sharpening the image and decreasing video artifacts. It took a solid 15 hours for my computer to process all those frames, so I'm not sure if/when I'll do another of these. Software used was Gigapixel AI from Topaz Labs.
Click the image below to see a close-up before/after comparison.
You can view the full opening here:
Or download it here.
Kingdom Hearts II Opening - Upscaled to 4k with Machine Learning