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I was thinking the same, smartphones would definitely do everything it can to make images sharp so it’s probably not going to be easily stackable.
Still it feels like something should be there to combine the pictures to make better drawing, as there’re softwares to generate 3D models from smartphone pictures.
It’s not even at OS level (unless you’re thinking fonts are OS level). So basically you’d just need to define a font, with certain unicodes with images you want, and make sure it ranks higher than other fonts. So the application will search for any characters in that font, and then for those you didn’t define, it’ll search in other fonts.