You thought image burn-in got eliminated with the passing of CRT monitor tech?

Think again.

For best results, the following test should not be done in a sunlit room.
And don't worry, the test has no permanent effect.

1) Open the following image in your browser, preferrably fullscreen or near-fullscreen, or download it and open it with an image viewer. It should just fill at least most of the screen, with no shiny whites around it.

RGB32_4K

Do you notice anything already?
If not...

2) Do the same with the following picture and leave it on screen for at least 5 minutes, better 15 or more, with the symbol more or less centered. (Ideally when you're not at the PC - no reason to idle in front of the computer.)

RGB0X_4K

Now open the first image again.
See what I mean?

This can be problematic for certain graphical applications where accurate display is important.