Luabify Quick device diagnostics

Color Banding Test Online: Check Screen Gradients, Bands & Posterization

Use this browser-based color banding test to inspect smooth gradients, spot visible color bands, and compare whether posterization or compression artifacts are coming from the display, content, or current settings.

Gradient inspection

Color banding preview

Switch gradient direction, palette, and banding intensity to compare smooth transitions against visible steps.

Compare the same palette before and after changing HDR, cable path, or GPU color settings.

This preview is designed to make visible banding easier to inspect. It does not measure true panel bit depth, color accuracy, or HDR calibration.

  • Start with grayscale if you want the fastest read on subtle banding in shadows and fades.
  • If a video looks worse than the smooth reference here, compression or source quality becomes a stronger suspect.
  • Retest after changing HDR, color depth, night mode, monitor presets, browser zoom, or streaming quality.

Result

Review the gradient setup currently shown in the preview. This is a browser-level visual inspection, not a measurement of panel bit depth or calibration.

DirectionHorizontal
PaletteGrayscale
IntensitySmooth
PreviewInline

Why run a color banding test online

This color banding test is built for the practical display problems people actually notice: a sky gradient that breaks into stripes, dark scenes with ugly steps instead of smooth fades, streaming video that looks compressed, or a monitor that seems to show rough transitions between shades. It helps you inspect those issues quickly in the browser without installing calibration software.

How the test works

The preview shows full-screen friendly gradients in different directions, palettes, and intensity levels. You can switch between horizontal, vertical, diagonal, and radial gradients, compare grayscale with colored ramps, and use split view to place a smooth reference next to a deliberately stepped version. That makes it easier to judge whether your screen is showing natural transitions or obvious banding.

How to interpret what you see

If the smooth view still looks like it breaks into hard stripes, the issue may come from the panel, current display settings, compression, low bit depth, or the content itself. If only the simulated stepped preview looks banded while the smooth reference stays clean, your screen is probably handling that gradient reasonably well. Repeat the same check after changing HDR, color depth, browser zoom, cable path, GPU settings, night mode, or streaming quality.

  • Grayscale is usually the fastest way to spot subtle banding in shadows and fades.
  • Colored ramps help reveal whether one channel looks worse than the others.
  • Split mode is useful when you want a clean reference next to a visibly stepped example.
  • Full screen makes faint banding easier to notice on larger monitors and TVs.
  • This is a visual browser-based check, not a professional panel calibration or bit-depth measurement.

The tool does not read monitor firmware, confirm true panel bit depth, or store personal data. It only gives you controlled gradients to inspect with your own eyes.

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Frequently Asked Questions

What does this color banding test check?
It helps you inspect whether gradients on your screen stay smooth or break into visible bands, steps, or posterized transitions. It is useful for display troubleshooting, streaming checks, and comparing screen settings.

What is color banding?
Color banding is when a gradient that should fade smoothly instead shows visible stripes or abrupt steps between shades. It often appears in skies, shadows, dark scenes, and compressed video.

Can this test tell me if the problem is my monitor or the content?
It can help you narrow that down visually. If both the smooth reference and your real-world content look heavily banded, the display path or settings may be involved. If the reference looks smooth but a video looks bad, compression or the source material is more likely.

Why should I test grayscale and colored gradients?
Grayscale makes subtle banding in shadows easier to spot, while red, green, blue, or mixed ramps can reveal whether one color channel looks worse than the others.

Why use split comparison mode?
Split mode puts a smooth gradient and a deliberately stepped version side by side. That gives you a quick visual baseline for how obvious real banding should look.

Can HDR, color depth, or GPU settings change the result?
Yes. HDR tone mapping, limited color depth, chroma subsampling, night mode, browser zoom, and GPU output settings can all affect how smooth gradients appear.

Does this measure true panel bit depth?
No. This is a visual browser test, not a hardware reader. It cannot confirm whether your panel is true 8-bit, 10-bit, or using dithering internally.

Is this color banding test private?
Yes. The test runs locally in your browser and does not require an account or personal data.