Monitor Color Uniformity Test

Test monitor color uniformity, detect screen color deviation, brightness unevenness, or dead pixels.

Instructions: Select colors below to test screen performance in different areas. Check carefully in full screen mode for brightness unevenness, color deviation, or dead pixels.

Pure White

HEX: #FFFFFF

RGB: 255, 255, 255

Check screen for brightness unevenness, color deviation, or dead pixels

Preset Test Colors

Custom Color

Gradient Test

Observe if the gradient is smooth, check for color banding or stepping.

Detected Issues
No issues detected yet. Start test and mark problem areas.

How to Test Monitor Color Uniformity

Select Test Color

Choose from preset colors or use custom color. Recommended to test pure white, pure black, red, green, blue, etc.

Enter Fullscreen Mode

Click "Fullscreen" button to fill the entire screen with test color for better edge and corner inspection.

Inspect Screen Carefully

Observe all areas of the screen, especially four corners and edges. Check for brightness uniformity and color consistency.

Mark Problem Areas

If you find brightness unevenness, color deviation, or dead pixels, click "Mark Issue" and click on screen to mark location.

Common Monitor Issues

Dead Pixels

Permanent bright or dark spots on screen

Brightness Unevenness

Some areas brighter or darker than others

Color Deviation

Inconsistent colors across screen

Backlight Bleed

Abnormal light leakage at screen edges

Technical Information

Monitor color uniformity refers to consistency of color display across different areas of the screen. Ideally, the entire screen should display exactly the same color and brightness, but due to manufacturing limitations, most monitors have some degree of uniformity issues.

Acceptable Uniformity Deviation:

  • Professional Monitors: ΔE < 3, Brightness deviation < 10%
  • Consumer Monitors: ΔE < 5, Brightness deviation < 15%
  • Basic Use: ΔE < 8, Brightness deviation < 20%

ΔE (Delta E) measures color difference. Lower values indicate smaller color differences. Typically when ΔE is less than 3, color differences are hard to detect with human eyes.

Frequently Asked Questions

Monitor color uniformity refers to consistency of color display across different areas of the screen. Ideally, the entire screen should display exactly the same color and brightness. Due to manufacturing limitations, most monitors have some uniformity issues, typically showing darker edges or color shifts in certain areas.

Dead pixels are permanent defects on the screen that appear as bright or dark spots across all color backgrounds. Dust is usually on the screen surface or inside protective layers, may not be visible on all color backgrounds, and might appear to move when tapping the screen or changing viewing angle. Using solid color tests makes it easier to distinguish between them.

Minor uniformity issues are inherent to monitors and usually cannot be fixed. Severe uniformity problems may be manufacturing defects that can be repaired or replaced under warranty. Software calibration can improve color accuracy but has limited effect on backlight uniformity.

During testing, pay special attention to the four corners and edges of the screen, where brightness unevenness and color deviation are most likely to occur. Also check the center area and compare it with edges. For large monitors, also check for unevenness in middle areas.
Fullscreen Test Mode

Inspect all areas of the screen carefully for brightness unevenness, color deviation, or dead pixels. Press ESC or click X to exit.