White Level Test
Count visible patches 223-254 on white background. All visible = healthy. Missing high = clipped highlights.
Look for the gray patches on the white background. You should see all patches labeled 223 through 254. If high values (250-254) blend into white, your monitor is clipping highlights - reduce contrast or check the OSD.
How to use
- Use Fullscreen patch grid with moderate ambient light so glare does not veil the brightest steps.
- Try lowering OSD contrast (~70–75%) if the top patches merge into clips before calibration.
FAQ
Do OLED panels behave differently?
Yes—ABL/APL can dim bright windows; rerun after the picture stabilizes and compare windowed vs fullscreen.
Introduction
Count visible patches 223-254 on white background. All visible = healthy. Missing high = clipped highlights.
Look for the gray patches on the white background. You should see all patches labeled 223 through 254. If high values (250-254) blend into white, your monitor is clipping highlights - reduce contrast or check the OSD.