Originally Posted by Witchboard
Correct, which is also expensive and the reason why I would have to upgrade to one later.
I currently have an 83" rear projection DLP HD TV which has a 40" screen height. Front row is 105" and rear is 148" currently. So I'd be looking for a screen size to maximize my current viewing distance in regards to 4K. Thanks noob. I'll check your provided link.
Sounds like an 125-140" 2.35:1 screen would be ok, very generally speaking.
Just with 4K, just because a movie is released in 4K does not mean it was shot in 4K, or the effects are done in 4K. On capable projector from a regular seating distance there is a difference. There's about 80 titles shot in 4K so far, excluding TV.
With 4K though, it's kind of a misnomer. The biggest improvement to 4K is not the resolution, but the HDR. And this is where the problem is. Since projectors can't reach the nits value of a TV, the source image has to be tone mapped to what the projector is capable of. Every manufacturer has it's own algorithm. Some are better than others.
Outside the latest generation of JVC projectors, all models have static tone mapping. Which means the projector tone maps to the highest brightness in the movie. If the brightness is lower then it has to be adjusted manually.
Latest gen JVC have dynamic tone mapping. It's automatic.
External boxes that can do dynamic tone mapping are excessively expensive, although it does depend on the budget.
A relatively cheap but not simple solution is a HTPC with madvr, but no streaming.
If you're interested and have a PC with an ok GPU you can try madvr's HDR tone mapping right now, even if the projector is not 4K and capable of WCG. A 4K UHD disc can bring an improvement over a 1080p Blu ray.
In a few years hopefully there will be more accessible solutions.