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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Red Screen Test - Isolate Red Sub-Pixels & Night Vision Mode
A dedicated Red Sub-Pixel Diagnostic tool (#FF0000). This tool saturates your display's Red channel to 100% while forcing Green and Blue to 0%. This is the primary method for detecting "Stuck" pixels (which will appear as dark dots or other colors) and checking for "Red Contamination" in your blacks. It is also an essential tool for calibrating warm color temperatures.
🔴 Why Test with Red?
Red screen testing isolates the red subpixels in your display. Each pixel is made of red, green, and blue subpixels. By showing pure red (#FF0000), you can:
- • Identify stuck green or blue subpixels (appear as cyan, green, or blue dots)
- • Verify red color accuracy and uniformity
- • Detect dead pixels (appear as black dots)
💡 When to Use Red Screen Test
The red screen test is ideal for:
- • Testing red color channel accuracy
- • Finding stuck green/blue subpixels
- • Verifying display quality for color-critical work
- • Part of comprehensive RGB testing
🔗 Related Display Tests
Complete RGB Testing
Test all color channels
Test green and blue subpixels to complete your RGB color accuracy check.
More Display Tests
Comprehensive diagnostics
Full pixel testing with patterns and calibration tools.
A dedicated Red Sub-Pixel Diagnostic tool (#FF0000). This tool saturates your display's Red channel to 100% while forcing Green and Blue to 0%. This is the primary method for detecting "Stuck" pixels (which will appear as dark dots or other colors) and checking for "Red Contamination" in your blacks. It is also an essential tool for calibrating warm color temperatures.
How to Use Color Palette & Display Tester
The "Stuck Pixel" Hunt
Scan the red ocean for any dot that isn't red. • Black dot = Dead Red sub-pixel. • Cyan/Blue dot = Stuck Blue/Green sub-pixel overpowering the red.
Uniformity Check
Does the red look "Deep Red" everywhere? If the corners look "Orange" or "Brown", your panel has backlight uniformity issues or viewing angle deficiencies (common in TN panels).
Calculator Features
Red Channel Isolation
Zero-tolerance testing for the Red sub-pixel. If it's weak, this test reveals it.
Warmth Calibration
Used by colorists to visually verify the "Warm" end of the spectrum.
Night Vision Preservation
Pure red light preserves natural night vision (rhodopsin), useful for astronomy or pilots.
Complete Function List
- Sub-pixel Isolation:
- Dead Red Detection:
- Stuck Green/Blue Finder:
- Color Gamut Saturation:
- Night Vision Mode:
- Uniformity Gradient Check:
- Contrast Evaluation:
Common Calculations & Examples
Example 1: Why is my "Black" screen red?
Problem: You see a red tint on your monitor when it should be black.
Steps:
- Open the Red Screen Test.
- If the Red is "Blindingly Bright" compared to Green/Blue tests, your Color Temperature is set too "Warm" (likely <5000K).
- Adjust your monitor RGB gain controls to balance the red intensity.
Explanation: Red LED phosphors often decay slower than blue ones. Old monitors often turn "Reddish". This test helps verify if the red channel is driving too hard.