i read through my notes about colour (super nerdy yes) and this is to possibly help and both confuse everyone yay!
RGB (red green blue) are primaries in digital colour and in trichromatic theory. when pixel values are set to 0 for all three colours we get black. if all three pixel values are set to 255 we get white. when Red is set to 255 and the others are set to 0 we get pure red and so on.
this theory is derived from young – helmholtz theory of colour vision.
read this to understand the wonderful world of colour it may help with your colour choices too :)