Accessibility is one of the key goals in the Gnome Project. Gnome developers have always sought to make computing accessible to everyone. One of the accessibility tools, the magnifier recently got an update that will make Gnome shell more comfortable for people with low vision.
Gnome developer, Joseph Scheuhammer, posted some screenshots of the latest improvements in the magnifier tool. The screenshot below shows the magnifier tool's inverse effects. The bottom half of the screen is magnified. The hues remain the same but lightness is inverted, and thus the window looks darker.
The below picture shows the same desktops, but with a 25% increase in contrast in the bottom one.
This features will be a great help for users with weak vision who want to invert the lightness, change the brigtness/contrast or some other controls according to their preferences.