What does "Screenshot Quality" do?

Solution 1:

To take a screenshot, you press the Prt Scr (Print Screen) button.

According to Bruce, a senior engineer at Overwatch, he posted on the forums this tidbit:

How to use – in the Graphics Option menu, under the Advanced items, there is a new setting called “Screenshot Quality”. Basically this setting controls the tile count of the screenshot. At 1x, screenshots are saved like we always have done – includes UI, saved in jpeg format, at the current resolution of the game. Once you select 3x through 9x resolution, you’ll enable high quality screenshot mode.

In addition, there are specific settings you must have enabled in order to make the most use of Screenshot Quality:

There are some restrictions on high quality screenshots to keep in mind. UI doesn’t render in a high quality screenshot. This mode only works in windowed mode and borderless windowed mode. High quality screenshots aren’t compressed, they are saved in BMP format. Finally, this can be taxing on your computer. Consider that creating a 9x resolution screenshot of a standard 1920x1080 display will create a very large 17280x9720 BMP file on your hard drive, so make sure you have both the memory and hard drive space for your screenshots before enabling this feature.