How this test works
Adjust your setup until the darkest intended patches are barely distinguishable from the background.
- Prepare the display using the checklist below.
- Select Start test and allow fullscreen mode if your browser asks.
- Use the arrow keys, on-screen controls, or click the pattern to move through the test.
- Exit the runner and save a local observation if useful.
Before you begin
- Use subdued room lighting
- Disable dynamic contrast
- Allow your eyes to adapt briefly
What to look for
- Which numbered dark patches are visible
- Tint in near-black gray
- Black crush or an overly raised black floor
Important: Ambient light and panel technology strongly affect near-black visibility. This is not a contrast-ratio measurement.
Frequently asked questions
What is black crush?
Black crush occurs when several dark shades appear as the same black, hiding shadow detail.
Should every patch be visible?
The darkest patches may be extremely difficult to see. The test is most useful for spotting clipping and comparing settings.
Why does the result change in a dark room?
Your eyes adapt to ambient light, changing how well you can distinguish near-black tones.