I just bought a ZH406 and found the color a bit off watching movies in SDR. Mainly blue looks a bit overcook and purple. It is relatively easy to fix by dropping the blue hue under "color matching". But the default for HDR is totally unwatchable. The whole picture looks pale in a yellowish and purplish tone. So I hope other owners of this or any Optoma laser projectors who find their HDR picture looking good can share your RGBCMYW values under "color matching" and RGB Gain/Bias so I can give it a try. I bet nothing can make my HDR picture look worse than what I am having now.