Swap black/white
Contrast Test Tool
Test your display contrast ratio with multiple black/white patterns. Check uniformity, sharpness, and text readability. Essential for photo editing, design work, and optimal viewing experience.
How to Use
- 1.Select a contrast pattern from the buttons above
- 2.Click the display or press 'F' to enter fullscreen mode
- 3.Press SPACE to cycle through patterns, I to invert colors
- 4.Look for bleeding, ghosting, or uneven contrast
- 5.All patterns should be sharp with no color fringing
Understanding Contrast Ratio
What is Contrast Ratio?
Contrast ratio measures the difference between the brightest white and darkest black your display can produce. Expressed as a ratio like 1000:1 or 5000:1.
Why Contrast Matters
- • Image Depth: Higher contrast = more depth and dimension
- • Dark Scenes: Better shadow detail in movies/games
- • Text Clarity: Sharper, more readable text
- • Color Vibrancy: Colors appear more vivid
- • Eye Comfort: Reduced eye strain in dark environments
Pattern Guide
▦ Checkerboard
Tests overall contrast and pixel alignment. Edges should be sharp with no color fringing.
||| Vertical Stripes
Checks vertical ghosting and response time. No smearing or trailing should occur.
☰ Horizontal Stripes
Tests horizontal uniformity and interlacing artifacts. Lines should be perfectly straight.
◧ Contrast Gradient
Reveals banding and gradient smoothness. Should show smooth transition without visible steps.
Aa Text Contrast
Tests readability at different sizes. All text should be sharp and easy to read.
Frequently Asked Questions
What's a good contrast ratio?
1000:1 is acceptable for general use. 3000:1+ is excellent for movies and photo editing. OLED's infinite contrast is ideal but expensive.
Should I see color fringing around edges?
No! Color fringing (chromatic aberration) indicates poor panel quality, incorrect pixel alignment, or overdrive artifacts. All edges should be pure black/white.
Why does my LCD have grayish blacks?
LCD backlights can't turn off completely, causing "backlight bleed." This is normal but varies by quality. VA panels have deeper blacks than IPS. OLED achieves true black.
How do I improve my monitor contrast?
Use dark room for testing, adjust monitor contrast setting (usually 70-80), reduce brightness to improve black levels, enable local dimming if available on LED displays.