If screens move to deep color, does that mean their contrast ratio would also change to show such great variations? Ie an extreme would be the brightness of the

If screens move to deep color, does that mean their contrast ratio would also change to show such great variations? Ie an extreme would be the brightness of the sun down to pure darkness. Or would it basically be the same as now, just we could fit more variations of color into the same contrast? It's hard to visualize because 8bpp color already seems like it covers every RGB I would need to see...