Brightness Test Tool
Calibrate your monitor brightness with 11 grayscale levels from pure black to pure white. Test brightness uniformity, gradient smoothness, and find the optimal brightness setting for your eyes.
How to Use
- 1.Use the slider or buttons to select a brightness level (0-100%)
- 2.Click the display or press 'F' to enter fullscreen mode
- 3.Use Arrow Up/Down keys to fine-tune brightness in fullscreen
- 4.Toggle gradient mode (press 'G') to check for banding
- 5.Adjust your monitor settings until all levels are distinguishable
Optimal Brightness Settings
🏢 Office Environment (Bright Light)
Recommended: 250-350 cd/m² (70-90% brightness). Higher brightness to compete with ambient light. All 11 levels should be clearly visible.
🏠 Home Use (Medium Light)
Recommended: 150-250 cd/m² (50-70% brightness). Balanced setting for mixed lighting conditions. Comfortable for extended use.
🌙 Dark Room (Low Light)
Recommended: 100-150 cd/m² (30-50% brightness). Reduce eye strain in dark environments. Black levels should remain deep, not grayish.
🎨 Color-Critical Work
Recommended: 120 cd/m² (calibrated). Professional standard for photo/video editing. Use hardware calibration tool for accuracy.
Understanding Brightness
Measurement of screen brightness. 1 nit = 1 candela per square meter. Most monitors range from 200-400 nits.
Lowest brightness the screen can display. Lower is better. OLED displays achieve true black (0 nits).
Difference between brightest white and darkest black. Higher ratio means better image quality. Typical: 1000:1 for LCD, infinite for OLED.
Frequently Asked Questions
Should I see all 11 brightness levels?
Yes! If you can't distinguish between adjacent levels (especially dark grays), your monitor brightness is too high or your contrast is miscalibrated.
What's the ideal brightness for my eyes?
Match your monitor brightness to ambient lighting. The screen should not be noticeably brighter or dimmer than your surroundings. Too bright causes eye strain, too dim causes squinting.
Why does black look gray on my screen?
LCD displays have backlight that can't turn off completely, causing elevated black levels. This is normal. OLED/AMOLED displays can show true black by turning off pixels.
What is gradient banding?
Visible steps or bands in smooth gradients instead of continuous transitions. Caused by limited color depth (6-bit vs 8-bit panels) or poor calibration.
Does brightness affect power consumption?
Yes! LCD brightness significantly affects power (backlight intensity). OLED power depends on content (white pixels use more power than black pixels).