Quick answer
A gray screen fills your entire display with solid gray (#808080). Click Fullscreen or press F and every pixel shows the same color, with no toolbars or distractions. A mid-gray field is the standard way to spot dirty screen effect, clouding, vignetting and color banding that bright colors hide.
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Use cases
Mid-gray reveals blotchy patches and vertical bands across the panel.
Uneven backlighting and vignetting are easiest to see on a neutral gray.
True gray should look neutral; any pink or green tint indicates calibration drift.
Mid-gray shows both dark smudges and light dust while wiping your display.
Gray Screen guide
A mid gray (#808080) is where panel flaws are easiest to see. Darker patches, vertical bands, a dirty-screen effect on large TVs and a slightly colored tint in one area all stand out on gray in a way they never do on white or black. Look at the screen from a normal distance with the room lights dim. For a guided version with several gray levels, use the screen uniformity test.
Faint outlines of taskbars, logos or keyboard shortcuts on a gray screen are signs of image retention, which fades, or burn-in, which does not. OLED owners should also run the OLED gray test, which steps through darker grays where OLED tinting appears, and the OLED burn-in test.
Gray is also a calm, neutral background for checking prints against the screen, photographing products without color casts, or as a low-distraction second screen. If you need a whole set of test patterns, the monitor test covers gray levels, gradients and sharpness in one place.
Some unevenness is normal on large LCD and OLED panels. If patches are obvious in everyday content, such as sports or web pages, the panel may be outside its warranty tolerance.
50% gray is best for uniformity. Darker grays (5–20%) reveal OLED tinting and near-black banding; use the OLED gray test for those.
No. Gray only makes it visible. Temporary image retention often fades after showing varied content for a while; permanent burn-in does not.
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