Color Gradient Test — Free Online Test
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.
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.