I think this is why one of the older analog video formats, I can't remember if it was VHS or NTSC, used less bandwidth for blue color than for the other colors.

I think this is why one of the older analog video formats, I can't remember if it was VHS or NTSC, used less bandwidth for blue color than for the other colors. This was not noticeable unless blue letters were recorded, which always looked more blurry than letters in other colors.