I don't understand why chromatic abberation isn't simply fixed in software. Knowing that your red, green, and blue images will have slightly different focus po

I don't understand why chromatic abberation isn't simply fixed in software. Knowing that your red, green, and blue images will have slightly different focus points and sizes seems pretty easy to fix. For a stationary scene, you simply take 3 separate photos - one focussed for each colour, and then rescaled to match each others sizes. For moving scenes, the math is more complex, but you should still be able to fix most of the issues. The only real issue is light that is "yellow" - ie. halfway in wavelength between different colours. The only perfect fix for that is to have each pixel be a spectrometer. Even that seems possible by using variable-bandgap sensors.