One of my readers recently wrote about a problem with loss of color on her iPad. The iPad had switched to black & white instead of showing all the usual colors. Here’s what I suggested:
Go to Settings > General > Accessibility > Display Accommodations > Invert Colors
Also possible you enabled Night Shift
Settings > Display & Brightness > Night Shift
Check the setting
If you need to use a certain Accessibility feature regularly, but don’t want to go through all the menus every time to activate/deactivate, you can set an accessibility shortcut.
General > Accessibility
Scroll to the bottom of the Accessibility pane
Tap Accessibility Shortcut
There you can choose one accessibility feature to activate when you rapidly triple-press the home button
For more on inverted colors on the iPad, see this article
Want to Learn Much More about using your iPad, iPhone or Mac?