This is a bit of an odd application but I figured I'd post here. We have a EIKI EK-623U projector mounted approximately 10 feet from a white glossy surface. The projector is mounted parallel to the surface and mirror mounted at 45 degrees is in front of the lens.
The projector is plugged in to a Windows PC via HDMI and is set to the recommended resolution of 1920x1200, "extended" display and "landscape, flipped". Focus, keystone, etc are set via the remote and at this distance when the center of the image is in focus the edges are a bit blurry. The projector is set to rear projection mode to correct for the mirror.
That photo is of a straight, 1 pixel wide line intersecting another. The lines are white on a black background. The photo was taken at an angle to reduce glare.
If you look at the lines they appear to be ~2 pixels wide (compared to the "grid" that you can see the projector throwing), however they also appear to vary in brightness along the length of the line, almost like it thinks the lines are on an angle and it needs to dither to present them correctly.
What's going on here?