Post by Quadibloc
Many TV sets and Blu-Ray players have built-in upscaling features. A similar technology was brought to video cards for gaming by Nvidia with their DLSS; this is on its 2.0 iteration, and in the meantime a simpler technolgy aimed at the same end is now available from AMD with Fidelity FX.
They both have 'Quality' and 'Performance' modes which upscale by 1.5x and 2x respectively.
They also both have a Balanced mode, but Nvidia upscales by 1.72x and AMD upscales by 1.7x.
This piqued my curiosity.
And when I switch resolutions on my monitor, the computer offers me a long list of resolutions. What are these resolutions, what different aspect ratios are associated with them?
Well, my idle curiosity led me to look up some facts which I now present to everyone on the page
from which you can see just what a mess the field of possible resolutions for computer monitors is. You can learn new facts, such as the fact that "21:9" aspect ratio wide monitors really have an aspect ratio of 21.5 to 9, or 43:18. You can find collected information on the mystery of the Balanced mode.
As others have pointed out, CRTs had a "Vertical Size" adjustment. It was not unusual for a piece of graphics software
to draw a circle on the screen and have the user adjust the VS so that it was round (vs. elliptical).
If you adjusted the VS for a 320x200 image so it took up the whole screen the pixels were not "square", if you adjusted VS
so that they were square, a lot of the screen was left blank, and things looked squished together.
And it just got worse with the Hercules card with a monochrome monitor (720x348), and later EGA (640x350), there is no
way you could ever get square pixels. It was a real pain in the neck for programmers doing low level graphics.
Now, you can just assume the pixels are square, and the assume the monitor is shaped weird (e.g. 5120x1440 for a recent
Samsung gaming monitor).