Screen Color Test
Test your monitor's color purity, gradients, saturation levels, and detect dead subpixels or banding issues.
What is a Screen Color Test?
A Screen Color Test displays pure colors, gradients, saturation patterns, and diagnostic grids to help you identify issues with your monitor's color reproduction. It's a quick, visual check for color tint, dead subpixels, banding, and color uniformity problems that affect everyday viewing and professional work.
Whether you're unboxing a new monitor, calibrating your display for photo editing, or troubleshooting visual artifacts in games, this test gives you a comprehensive overview of your screen's color health.
Why Test Your Monitor's Colors?
- Dead Subpixels: Tiny colored dots visible on solid color screens indicate a subpixel that's permanently stuck ON or OFF. Different from full dead pixels, they only appear on specific colors.
- Color Tint: White screens may appear yellowish (warm) or bluish (cool) due to factory color temperature settings. Adjust to 6500K for neutral white.
- Gradient Banding: Visible stepping in smooth gradients reveals limited bit depth (8-bit vs 10-bit), cable bandwidth limitations, or incorrect GPU color settings.
- Saturation Accuracy: Uneven saturation across channels can indicate poor color gamut coverage or profile misconfiguration.
- Viewing Angle Shift: Colors changing when viewed off-axis is common on VA and TN panels, but shouldn't happen on IPS panels.
How to Use This Test
- Select a Pattern: Choose from 8 test patterns using the tabs above — Pure Colors, RGB Bars, Gradients, Saturation Grid, Color Grid, Grayscale Steps, Contrast Test, or Custom Color.
- Go Fullscreen: Press F or click the Fullscreen button for the most accurate testing experience. This eliminates browser UI interference and fills your entire screen.
- Check Pure Colors: Look for any tiny colored dots (dead subpixels) on solid color screens. Cycle through Red, Green, Blue, White, and Black.
- Test Gradients: Look for visible steps or banding instead of smooth transitions. This is critical for video editing and gaming.
- Compare RGB Bars: All three primary bars should appear pure without visible tint or cross-contamination.
- Check Grayscale: All 16 shades from black to white should be distinguishable and evenly spaced.
- Complete the Checklist: Use the diagnostic checklist below the test area to track your findings and download a summary report.
Understanding the 8 Test Patterns
| Pattern | What It Tests | What to Look For |
|---|---|---|
| Pure Colors | Dead subpixels, color purity | Tiny dots that don't match the background color |
| RGB Bars | Primary color accuracy | Each bar should be pure with no cross-tinting |
| Gradients | Banding, bit depth | Smooth transitions with no visible steps |
| Saturation | Color gamut, saturation uniformity | Even progression from 25% to 100% saturation |
| Color Grid | Primary + secondary color accuracy | All 8 colors (RGBW + CMYK) should appear distinct |
| Grayscale | Gray uniformity, gamma accuracy | All 16 shades should be distinguishable |
| Contrast | Contrast ratio, text legibility | Text should be crisp on both white and black backgrounds |
| Custom | Any specific color | Test a particular HEX/RGB value for uniformity |
Common Color Issues by Panel Type
| Panel Type | Color Accuracy | Viewing Angle | Common Issues |
|---|---|---|---|
| IPS | Excellent | Wide (178°) | IPS glow, slight backlight bleed |
| VA | Good | Moderate | Color shift from angles, black crush |
| OLED | Excellent | Wide | Slight shift at extreme angles, burn-in risk |
| TN | Fair | Narrow | Major color shift, washed out from angles |
Tips for Accurate Color Testing
- Use Fullscreen Mode: Browser UI elements and window borders can introduce color contamination. Always test in fullscreen for accurate results.
- Disable Night Mode: Windows Night Light, f.lux, or macOS Night Shift adds a yellow tint that will skew your results. Disable these before testing.
- Clean Your Screen: Dust, fingerprints, and smudges can be mistaken for dead subpixels. Wipe your screen with a microfiber cloth first.
- Set Correct Color Depth: In your GPU control panel (NVIDIA/AMD), ensure output color depth is set to the highest supported value (8-bit or 10-bit).
- Use DisplayPort or HDMI 2.0+: Older cables may limit bandwidth and introduce compression artifacts that cause false banding.
Related Display Tests
Finished testing screen colors? Continue diagnosing your monitor with these related tools:
- Dead Pixel Test — Find dead or stuck pixels with fullscreen solid colors.
- Display Test — Professional 21-test monitor suite for comprehensive diagnostics.
- Color Accuracy Test — Check gradient smoothness and black levels.
- Screen Bleeding Test — Test for backlight bleed and IPS glow.
- Refresh Rate Test — Measure your monitor's actual Hz.
- Frame Skip Test — Detect dropped frames and frame skipping.
Frequently Asked Questions
What causes color banding on my monitor?
Banding occurs when there aren't enough color steps to display smooth gradients. Common causes include 8-bit panels (vs 10-bit), HDMI bandwidth limits, video compression, or incorrect color depth settings in your GPU driver (NVIDIA Control Panel → Change Resolution → Output Color Depth).
Can I fix my monitor's color tint?
Yes, in most cases. Access your monitor's OSD (On-Screen Display) menu and adjust the color temperature to 6500K for neutral white. You can also fine-tune individual RGB gain values. For professional accuracy, use a hardware colorimeter like the X-Rite i1Display or Datacolor SpyderX.
What's the difference between a dead pixel and a dead subpixel?
A dead pixel is an entire pixel (all 3 subpixels) that fails, appearing as a permanent black dot on all colors. A dead subpixel is one of the three color components (R, G, or B) that fails, causing a tiny colored dot visible only on certain backgrounds. Dead subpixels are more common and harder to spot.
How often should I test my monitor's colors?
Test after buying a new monitor (within the return period), after GPU driver updates, or if you notice visual anomalies. For professional color work, calibrate monthly. For gaming and general use, panel colors remain stable for years.
Is this test as good as hardware calibration?
No. This test identifies visual issues but cannot measure precise color values like ΔE (color accuracy). For professional color grading, photography, or print design, you need a hardware colorimeter and calibration software. This test is ideal for quick visual checks and detecting obvious defects.
Why do gradients look banded on my 10-bit monitor?
Even with a 10-bit panel, banding can appear if your GPU output is set to 8-bit, or if your cable doesn't support the required bandwidth (e.g., HDMI 1.4 at 4K). Check your GPU control panel settings and ensure you're using a high-bandwidth cable (DisplayPort 1.4 or HDMI 2.1).
Can browser rendering cause false banding?
Yes. Browsers typically render content in 8-bit (sRGB) color space regardless of your monitor's capabilities. If you see banding in this test but not in native applications, it may be a browser limitation rather than a monitor defect.