Monitor Test: Dead Pixels, Backlight Bleed, Burn-in & Ghosting Check
Comprehensive monitor test suite: check for dead pixels, backlight bleed, IPS glow, OLED burn-in & motion ghosting. Free diagnostics for all screens.
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50% Gray Screen Test - Professional Uniformity & Mura Detection
This gray screen test displays 50% gray (#808080) in fullscreen - the ideal brightness level for detecting display uniformity issues. Professional calibrators use gray screens because they reveal IPS glow in corners, backlight clouding, color tinting, and other defects that may be invisible on pure white or black backgrounds. A properly calibrated display should show perfectly neutral gray with no pink, green, yellow, or blue tint.
⬜ Why 50% Gray is Ideal for Testing
50% gray (#808080) is the sweet spot for uniformity testing because:
- • Bright enough to reveal backlight issues
- • Dark enough to not mask subtle defects
- • Perfect for detecting IPS glow and color tinting
- • Used by professionals for calibration verification
🔍 What to Look For
- • IPS Glow: Lighter areas in corners when viewed at angles
- • Backlight Bleeding: Light leaking around edges
- • Color Tinting: Areas that appear pink, green, or yellow instead of neutral gray
- • Clouding/Mura: Irregular patches of lighter or darker areas
🔗 Related Display Tests
Pixel & Screen Tests
Find display defects
Test for dead pixels and backlight bleeding with solid color screens.
Calibration Tests
Color accuracy & quality
Check color accuracy and gradient banding with professional patterns.
This gray screen test displays 50% gray (#808080) in fullscreen - the ideal brightness level for detecting display uniformity issues. Professional calibrators use gray screens because they reveal IPS glow in corners, backlight clouding, color tinting, and other defects that may be invisible on pure white or black backgrounds. A properly calibrated display should show perfectly neutral gray with no pink, green, yellow, or blue tint.
How to Use Color Palette & Display Tester
Starting the Gray Screen Test
Click "Start Gray Screen Test" or press keyboard shortcut 'Y' to activate a fullscreen 50% gray display. The screen will fill with neutral gray (#808080), which is ideal for checking display uniformity and detecting various panel issues.
Checking Backlight Uniformity
Look for areas that appear lighter or darker than the rest of the screen. This indicates backlight uniformity issues. IPS panels often show "IPS glow" (lighter areas in corners when viewed at angles). VA and TN panels may show clouding or mura effects.
Detecting Color Tinting
A neutral gray should appear perfectly gray without any color tint. Look for areas that appear slightly pink, green, yellow, or blue. Color tinting indicates calibration issues or panel defects.
Viewing from Different Angles
Move your head and view the screen from different angles. IPS glow and other uniformity issues are often more visible at certain viewing angles. This helps assess real-world viewing performance.
Calculator Features
Uniformity Testing
50% gray (#808080) is the optimal brightness level for detecting backlight uniformity issues and panel defects.
IPS Glow Detection
Reveals IPS glow in corners typical of IPS panels, helping assess real-world viewing performance.
Color Neutrality Check
Verify your display produces true neutral gray without pink, green, yellow, or blue color tinting.
Calibration Verification
Professional calibrators use gray screens to verify white point accuracy and display neutrality.
Complete Function List
- 50% gray (#808080) fullscreen:
- Backlight uniformity testing:
- IPS glow detection:
- Color tinting visibility:
- Calibration verification:
- Keyboard shortcut (Y):
- Mura and clouding detection:
- Works on all panel types:
- Professional-grade testing:
Common Calculations & Examples
Example 1: Checking IPS Monitor for Glow Issues
Problem: You want to assess how much IPS glow your new monitor has
Steps:
- Run the gray screen test in a dark room
- View the screen from your normal position first
- Then view from various angles - particularly from below
- Note any corners or edges that appear brighter or have a yellow/white glow
- Assess whether the glow level is acceptable for your use case
Explanation: Some IPS glow is normal and expected. It's most visible at angles and in dark rooms. Excessive glow that's distracting during normal use may indicate a panel defect.