Ah, but the blue receptors in your eye are as accurate as the green ones, just less tightly packed. Spatial filtering therefore preserves more-visible color ac

Ah, but the blue receptors in your eye are as accurate as the green ones, just less tightly packed. Spatial filtering therefore preserves more-visible color accuracy at the expense of less-visible blue location. Not that that stops all those standards that use reduced bit depth for red and blue.