I
wrote earlier about this LG ultrawide monitor: 2560x1080 pixels, about 34" diagonal.
Although it's great having all the pixels, the screen didn't look all that good on my
Linux machine.
I created the image file you see at left. The squares in the upper-left corner have the red pixel turned on at x=0, 5, 10, 15,
etc., and at y=0, 5, 10, 15,
etc. I wanted to have just one of the color-dots on in each pixel,
and I thought a black background would show up better what was going on.
I ran the display(1) program (from ImageMagick) and pulled out my camera. The picture below shows
the sad story.
As you can see, the horizontal lines look more or less like lines, but the vertical lines are a mess.
Before I examined the screen carefully, I had assumed the card didn't have enough horizontal pixels; maybe it
had just 1920 per line, and it was dithering or something to decide what signal to send. But then I thought
we ought to get a clean vertical line at some point.
So this is a puzzle. When I hooked this monitor up to the lovely Carol's macbook, the display looked
great, not muddy at all. I wondered if it was the cable; I bought a new one with better specs. Maybe it
looks a little better, but the photo was shot while using the new cable. Maybe I should be using the card's DVI
outputs rather than the mini-HDMI output? I have no idea.
