

0 to 1 is monochromacy, a single visual channel, eg only rods and no cones. I thought that was fairly clear. Full colour vision would be closer to 0,0,0 to 1,1,1 (plus low-light rods). Null would be no visual channels at all, ie completely blind. I didn’t miss the point of your example, it’s just a very bad analogy.
Here’s a quick article I found which demonstrates how individual channels are monochromatic and you only get full colour by combining channels, digital image formats were designed for human eyes so this is much more analogous to human vision. With no channels you get nothing at all.
It’s closer to planet 1.4 million if you include the rest of the dwarf parts and minor planets under the same logic. It gets a little hard to remember all the names at that point though.