Gray Banding Test for Monitors and OLED Screens

Three-step gray banding test

01Use your normal picture mode, set browser zoom to 100%, and pause night-light, dynamic contrast, and automatic brightness features.
02Start with Full gradient, then check Dark gradient. Smooth areas should not break into prominent fixed steps, stripes, or tinted sections.
03Switch to 5% gray for OLED near-black vertical banding and 50% gray for broad DSE or brightness bands. Enter fullscreen for the final check.
04Confirm any distracting result with another browser and representative photos, games, or video before changing settings or judging the panel.

Read the pattern you selected

Hard boundaries that follow equal-tone regions in a gradient are tonal banding or posterization, not screen uniformity bands.
Fixed vertical stripes on the 5% solid field are consistent with near-black OLED uniformity variation; check whether they remain distracting in normal dark scenes.
Broad darker or lighter areas on 50% gray are better described as gray uniformity or dirty-screen effect, even when users casually call them banding.

Interpretation guide

Identify which kind of gray banding you are actually seeing

Gradient banding is a transition problem

A grayscale gradient asks the signal chain to reproduce many nearby tones in sequence. Banding appears when that smooth change breaks into visible plateaus, contour lines, or blocks. The source can be a low-precision image, video compression, a calibration curve, limited-range conversion, browser or GPU processing, display electronics, or the panel. The full gradient gives a quick overview; the near-black gradient expands the range where small code-value differences are hardest to reproduce. A visible step is a symptom to trace, not automatic proof that the panel has a particular bit depth.

OLED gray bands are usually a uniformity problem

When OLED owners say gray banding, they often mean stationary vertical columns visible on a dark, flat gray screen. Those bands do not follow a tonal gradient; they occupy fixed physical positions and may change in visibility with gray level, temperature, compensation cycles, and viewing conditions. The 5% field is included because near-black variation can be easier to see there, while 50% gray reveals broader dirty-screen patterns and tint. Judge both from the normal seating position and confirm the effect in real dark scenes or camera pans before treating it as a practical defect.

Why four presets are more useful than dozens of controls

Existing online tools commonly offer many gray blocks, step counts, sliders, directions, automatic sequences, and shortcut combinations. Those options can be useful for specialist investigation, but they also mix gray discrimination, clipping, uniformity, and gradient handling into one interface. This page keeps only four high-value screens: a full gradient, a dark gradient, 5% solid gray, and 50% solid gray. Together they answer the first diagnostic question—transition or spatial variation—without requiring the user to understand bit-depth simulations or configure a test before seeing a result.

Use the neighboring tools when the symptom has a clearer name

If the solid fields reveal patches, tint, vignetting, or dirty-screen effect rather than narrow bands, continue with the Gray Uniformity Test, which provides more adjustable full-field levels. If the gradient is smooth but the darkest shades disappear, use the Black Level Test; if bright shades merge, use White Saturation. The broader Gradient Test adds color ramps when the artifact appears in red, green, blue, or mixed hues. Keeping these tasks on separate pages reduces accidental setting changes and makes each result easier to describe when seeking support.

Reliable visual testing

Build a repeatable test before judging the display

A browser pattern is a controlled visual stimulus, not a measuring instrument. It is excellent for finding visible non-uniformity, clipped tones, scaling errors, halos, color shifts, and motion artifacts under the conditions in which you actually use the screen. It cannot, by itself, report luminance in candelas per square metre, a color difference value, a gamut percentage, or a response-time number. Those claims require a meter, defined test windows, timing equipment, and a documented procedure. Use this page first as a practical screening and comparison tool: it can tell you where to look, whether a change is repeatable, and whether one setting or one display looks better than another.

Treat the entire signal path as part of the experiment. The image passes through the page, browser, operating-system color management, graphics driver, cable or wireless link, monitor input mode, picture preset, and panel before it reaches your eyes. Browser zoom, system scaling, non-native resolution, night-light software, HDR conversion, an ICC profile, dynamic contrast, local dimming, sharpening, noise reduction, and variable refresh can each alter the result. A suspicious pattern therefore does not automatically prove a panel defect. Record the active resolution, refresh rate, browser, picture mode, brightness, contrast, color temperature, HDR state, and any adaptive features so that you can reproduce the observation.

Control the room before comparing results. Allow the display to reach a stable operating state, clean the screen with the method recommended by its manufacturer, and prevent direct reflections from crossing the test area. Use moderate, stable ambient light for general checks. Use a dim room only for near-black, black-uniformity, and blooming observations, because those artifacts are easily hidden by reflections and eye adaptation. Do not judge a dark screen immediately after looking at a bright white page; give your vision a short period to adapt. Keep your normal viewing distance and eye height unless the test specifically asks you to move off-axis.

Run the first pass at the panel's native resolution with browser zoom at 100 percent. Full screen reduces distractions, but it does not cancel operating-system scaling or color processing. Inspect once from your normal position, then move closer only to identify the structure of an artifact. Change one control at a time and repeat the same pattern after every change. If several settings move together, you lose the ability to say which one helped. A useful comparison is A/B/A: observe the baseline, apply one change, then return to the baseline. If the effect disappears and returns with the setting, the relationship is more credible than a single impression.

Look for repeatability across content, positions, and inputs. Rotate or move the pattern when the tool allows it. Test a second browser, input, cable, refresh rate, or computer if the finding matters. A mark that stays in the same physical place on the panel is more likely to be display-related; a mark that follows a browser window or screenshot may originate earlier in the signal chain. Photographing the screen can help document location and severity, but a camera introduces exposure, focus, lens shading, moiré, rolling shutter, tone mapping, and white-balance errors. A photograph is evidence of what the camera captured, not a substitute for a calibrated reading.

A compact pre-test checklist

01Stabilize the display

Let brightness and temperature settle, disable screen savers, and avoid testing while the device is rapidly changing power or thermal state.

02Confirm the signal

Use native resolution, verify the intended refresh rate and RGB range, set browser zoom to 100 percent, and note whether SDR or HDR is active.

03Neutralize temporary processing

Pause night light, automatic brightness, dynamic contrast, content-adaptive brightness, and vendor enhancement modes unless one of them is the feature being tested.

04Control the environment

Remove glare, keep ambient light stable, sit square to the screen, and use a darker room only when the test calls for near-black observation.

05Make one change

Adjust only one setting between runs, return to the original value for confirmation, and write down values instead of relying on memory.

06Repeat before concluding

Reopen the pattern, try representative real content, and check another browser or input when the consequence of a wrong conclusion would be costly.

How to turn an impression into useful evidence

Describe what you see without jumping directly to a diagnosis. Record the pattern, color or tone, screen region, viewing distance, room lighting, time after power-on, and whether the artifact changes with angle or settings. Terms such as “a pale vertical band in the left third on 30–50 percent gray” are more useful than “the panel is bad.” Severity should be tied to normal work: state whether the effect is visible only in a dark test room, during ordinary desktop use, or in real video and games. This makes comparisons between presets, firmware versions, and replacement units much more meaningful.

Escalate the method when the decision requires numbers. Photographers and designers may need a colorimeter or spectrophotometer for white point, gamma, tone response, color accuracy, and uniformity. HDR evaluation needs defined test windows and an instrument that can measure bright highlights and dark levels. Motion measurements need synchronized capture or a validated pursuit-camera method. Warranty decisions should follow the manufacturer's pixel, uniformity, and return policies rather than an unofficial universal threshold. The visual test remains valuable: it identifies the question that a formal measurement needs to answer.

What a visible symptom may mean

Hard steps across a smooth ramp

Treat this as gradient banding. Compare another browser and neutral picture mode, then check an uncompressed or well-mastered source before blaming the panel.

Fixed vertical stripes on 5% gray

Treat this as near-black spatial uniformity. Check 10% and normal dark scenes to determine whether the stripes remain relevant outside a test screen.

Wide dirty patches on 50% gray

This is closer to dirty-screen effect or gray non-uniformity. Continue with the adjustable uniformity page and observe real panning content.

Bands appear only in streaming video

Compression or the content master may be responsible. A clean browser-generated gradient helps separate source banding from a display-wide problem.

What this browser test cannot prove

The page cannot identify panel bit depth, measure luminance uniformity, certify a 10-bit signal, or prove that a visible band originates in hardware. Browser rendering, the operating system, graphics output, display settings, ambient light, and the source can all affect the observation.

Gray banding test questions

Is gray banding the same as gray uniformity?+

No. Gradient banding is a failure of smooth tonal transitions, while gray uniformity describes brightness or tint differences across a flat field. OLED users sometimes use gray banding for fixed vertical uniformity stripes, which is why this page tests both meanings separately.

Which pattern should I use first?+

Choose Full gradient if skies, shadows, or menus show contour-like steps. Choose 5% gray if an OLED shows fixed vertical stripes in dark scenes. Use 50% gray for sports-field DSE or broad dirty-looking patches.

Methodology and further reading

The page structure reflects the split visible in current search results and established test methods. Published gradient tests use smooth ramps to evaluate tone transitions, while gray-uniformity methods use full-field 5% and 50% gray to examine spatial variation. Source names are retained for methodology transparency without creating outbound links.

Our Monitor Gradient TestsRTINGS

Our TV Gray Uniformity TestsRTINGS

EIZO Monitor Test — Gradients and UniformityEIZO

GRAY BANDING TEST

The phrase gray banding describes two different screen symptoms