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A screen's reflective surface can have a very different effect than a painted wall. For example, a screen's surface may be designed to reflect light that hits perpendicularly while not reflecting light that hits above a certain angle of incidence. Those are screens that have a narrower viewing angle. This can be an advantage or a disadvantage, depending on your needs.

Screens that do that can also exhibit hotspotting, while screens that take that into account from the beginning would not exhibit that problem, but further narrow the viewing angle.

Gray screens are often used to improve black levels with LCD and sometimes DLP projectors since they are not able to produce blacks as well as traditional CRT projectors.

Black screens can be used to accomplish something similar in rooms without light control.

What do I use? Blackout cloth from the fabric store. But I can do this because I have a light-controlled room, a black canopy above, red wine velvet curtains to the sides, and black felt on top of my center speaker. Otherwise reflected light is too distracting.

And I would argue that the room is the weakest link in home theater, not the speakers.
 

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Okay, so you cheated a little. :p You used real 35mm film with a high quality light source. The rest of us have consumer-grade LCD/DLP projectors which aren't going to look good in comparison. Maybe he also did good things to his wall too, like sanding it down and using the right kind of paint.

You and he are correct that you don't necessarily need >1 screen gain on a smaller screen. You may even want <1. But that doesn't mean a wall is always better. And you certainly weren't comparing apples to apples here.

My understanding is 35mm film is 4000 lines, based on theater viewing distances, and that's why they're currently digitizing film at 4000 lines.

As for N. Korea...well, I think my opinion differs from yours. ::shrug::
 

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Um, I think the point was you were being a little trollish and dishonest in your original post.
 
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