Online Gradient Test – Check Color Smoothness & Banding Issues

The Color Gradient Test displays smooth transitions across the full brightness and hue range so you can spot color banding, posterization, and gamma issues on your display. On a healthy 8-bit or 10-bit panel, the gradient should look like an even, continuous blend from black to white or from one color to another. If you see visible steps, stripes, or sudden brightness jumps, your panel is either dithering poorly or running at a reduced color depth (often 6-bit + FRC on cheaper laptop screens). This is a quick, no-install way to verify what your monitor actually resolves — not just what its spec sheet claims.

How to use the Color Gradient Test

Set your display brightness between 60% and 80% for the most accurate assessment.
Turn off dynamic contrast, HDR auto-adjust, and any "vivid" picture modes.
Click Start to launch the full-screen gradient sequence.
For each gradient, step back about 60 cm from the screen and look for visible bands or stripes.
Cycle through the grayscale, red, green, blue, and combined gradients.
Note any banding — you can use the results in a warranty claim or return.

How to interpret your results

A perfect 10-bit panel shows a completely smooth, seamless gradient with no visible transitions. Good 8-bit panels show extremely faint banding only under close inspection. 6-bit + FRC panels (common on budget laptops) show mild but visible bands, especially in dark grays and skin tones. Anything with obvious, wide stripes indicates a driver issue, wrong color profile, or a low-quality panel not suited to photo/video work.

Common issues and what they mean

Heavy banding on a "10-bit" panel

Check that your OS is configured to output 10-bit color. On Windows: NVIDIA/AMD control panel > 10-bit color depth. On macOS: it is enabled automatically on supported panels.

Banding only on one color channel

This is a driver-level issue. Update your GPU driver, then reset the color profile in Display settings.

Gradient looks stepped in HDR

Windows HDR often produces poor gradients unless calibrated. Run Windows HDR Calibration or disable HDR for SDR content.

When to run this test

Before buying or accepting a monitor advertised for photo/video work.
When comparing two panels or laptops during a purchase decision.
After a driver update, if colors suddenly look "posterized".
Before starting a color-critical project like print design.

Why banding happens: the bit-depth budget

An 8-bit channel has 256 shades of each primary, about 16.7 million colours. That is enough that a full-screen grey ramp shows slight stepping if you look for it, because 256 shades stretched across 1,920 or more pixels make each shade a visible band. A 10-bit channel has 1,024 shades, about 1.07 billion colours, and gradients look continuous.

Many budget laptop panels are 6-bit (64 shades per channel) and simulate 8-bit with Frame Rate Control, flickering pixels between neighbouring shades. Done well it is invisible; done badly you see banding plus a faint shimmer. Banding appears when any link in the chain (content, GPU output, cable or panel) drops below the precision the image needs, so the job is finding the weak link.

Reading the pattern

Severe banding across every ramp points at a pipeline setting: colour depth forced down somewhere, a limited-range (16 to 235) signal feeding a full-range display, or a night-light or colour-filter app. Banding only in dark regions is typical of 8-bit panels with poor gamma and often improves with calmer contrast and correct gamma. Banding with faint moving noise suggests a 6-bit plus FRC panel doing its best.

For a reference, run the same test on a modern phone: most have very clean OLED gradients and show what smooth should look like.

Fixes, cheapest first

Update the GPU driver first; colour-depth and dithering bugs are fixed regularly. Then check the output colour depth (NVIDIA Control Panel, Change resolution, Output color depth; AMD display settings, Color Depth; Intel Graphics Command Center, Display) and choose the highest offered. If only 6-bit is offered, the cable or adapter is limiting you.

Set the output to full RGB range (0 to 255) for monitors; a limited-range signal on a full-range panel squeezes 256 steps into about 220 and creates banding. Swap the cable or port if the resolution and refresh rate may exceed its bandwidth, which can silently drop the link to a lower bit depth. Then disable night-mode filters, HDR emulation and vivid picture modes, retesting as you re-enable each one.

GPU dithering is the most effective fix for stubborn banding on 8-bit panels: it adds fine noise that breaks bands into an even grain the eye reads as smooth. AMD exposes it in the driver; on NVIDIA under Windows it is a registry-level option.

When the banding is in the content

Heavily compressed streaming video ships with banding, especially in dark scenes, because low bitrates flatten subtle gradients before they reach your display. If one video bands but this test does not, the display is fine. Some games also render skies in 8-bit without dithering, which no monitor setting can fix.

A 10-bit display is a real upgrade for photo editing, grading and HDR work. For everything else, a correctly configured 8-bit pipeline with dithering shows so little banding in real content that most people cannot tell the difference.

Frequently asked questions

What causes color banding?

Banding happens when your panel or GPU pipeline cannot represent enough intermediate shades to draw a smooth gradient. Causes include 6-bit panels, incorrect color depth settings, aggressive dynamic contrast, or a mismatched color profile.

Can banding be fixed?

Sometimes. Try updating GPU drivers, enabling 10-bit output, disabling dynamic contrast/vivid modes, and using the panel's native color profile. Banding caused by a 6-bit + FRC panel cannot be fully removed — only masked with dithering.

Does banding matter for gaming?

Only slightly — most games use dithering that hides it. It matters much more for photo, video, and print work.