Yes, the green is absorbing the other colors, so color accuracy would be better with a neutral grey, or white. I'll probably go white since I want all the brightness I can get. It's popular as of late to go with a neutral grey to attenuate some of the light for better contrast and darker darks, but I would think you could accomplish much the same by reducing brightness on the projector end. That said, I'm pretty darn impressed with this "roughed in" setup. AllDarc would be appalled.
My original plan was to mud the wall smooth and paint white, but now I'm wondering if an accoustically transparent screen is a better strategy. My speakers are tall enough that it interferes with where I want my screen to be displayed. An acoustically transparent screen would let me place the speakers behind.
My project in case anyone has suggestions:
https://www.avsforum.com/forum/15-ge...tor-vs-tv.html