Monitor Ghosting Test — Check for Trailing & Smearing
A bright disc crosses your screen at speed. Follow it with your eyes: the trail behind it is your panel's ghosting, made visible. Change speed and background to find where your display struggles most.
How to read this ghosting test
Lock your eyes onto the disc and track it as it crosses — do not watch the screen as a whole. What you see behind the disc is the test result. A well-behaved panel shows a crisp edge with at most a short, faint shadow. A slow panel smears: the disc stretches into a comet, and on dark backgrounds a pale trail can stretch a quarter of the way across the screen behind it. Switch between the black, grey and white backgrounds, because pixel transitions are not equally fast in every direction — many panels are quick from black to white but sluggish between two mid-greys, which is exactly the transition games use most, and exactly why the grey background often looks worst.
Speed matters too. At the slow setting almost any modern panel looks clean; at the fast settings the differences open up. That mirrors real use: ghosting rarely bothers anyone in a spreadsheet, and it is maddening in a fast shooter or a racing game, where the whole scene is the moving object. If the trail bothers you here at the speed closest to your games, it is the panel, not your eyes, and no frame rate increase will fix it — higher FPS adds more frames but each one still smears.
Fixes worth trying before blaming the panel
Start with the monitor's own menu. The overdrive control — labelled Response Time, OD, AMA or Trace Free depending on brand — pushes pixels harder to transition faster. The middle setting is usually the sweet spot; maximum overdrive commonly overshoots, painting a bright fringe in front of the object called inverse ghosting or corona, which many people find worse than the original trail. Test each setting here for ten seconds. Next, if your monitor offers a motion clarity mode (ULMB, ELMB, DyAc, black frame insertion), try it: strobing the backlight hides most of the transition, at the cost of brightness and sometimes flicker sensitivity. Finally, confirm you are actually running at the panel's full refresh rate with the refresh rate test — a panel stuck at 60Hz ghosts more simply because each frame is held longer. For the physics of why frames blur at all, see frame time explained.
The pursuit method, for a photograph of the truth
- Set the speed to Normal and the background that ghosted worst.
- Hold a phone or camera and pan it smoothly, following the disc so it stays in the same place in the frame.
- Take the photo mid-crossing. The disc should be sharp; everything it left behind is the trail your tracking eye perceives.
- Compare photos across overdrive settings — the shortest clean trail wins.
Frequently asked questions
What is monitor ghosting?
Ghosting is a faint trail left behind a moving object, caused by pixels that change colour too slowly to keep up. It is most visible on VA panels and on any screen with slow grey-to-grey response times.
How do I read the ghosting test?
Follow the moving disc with your eyes. A short, tight edge behind it is normal; a long smear or a bright or dark trail stretching several centimetres means slow pixel transitions. Try the black, grey and white backgrounds — some panels ghost worst on one of them.
What is the pursuit camera method?
Move a camera along with the object, keeping it centred, and photograph it. The frozen image shows exactly the trail a tracking eye perceives, which is how review sites measure perceived blur instead of guessing.
Can settings reduce ghosting?
Often. Most gaming monitors have an overdrive setting (Response Time, OD, Trace Free) — the middle setting usually helps most; the highest often overshoots and creates bright inverse-ghosting coronas instead. Turning off motion-blur-reduction backlights also changes the picture.
Is ghosting the same as motion blur?
They overlap but differ: sample-and-hold blur comes from the frame being held steady while your eye moves, while ghosting is the pixel itself lagging. This test shows the combination your eyes actually see.