Greyscale & Uniformity Test
Check gray levels and screen uniformity - distinguish nearby shades and spot uneven areas.
Look for gray patches that merge together or disappear.
Current: Greyscale · Full Range · 17 levels
← → change · F fullscreenMode
Greyscale range
Levels
More levels make smaller differences between shades harder to distinguish. Look for gray patches that merge together or disappear.
Test level
Full-screen gray field. Check the center, edges, and corners for darker, brighter, cloudy, tinted, or uneven areas.
What do you see?
Your result:
No selection yet - pick what you see above.
Guide
How to test
01
Set display normally
Use your usual brightness and picture mode.
02
Go full screen
Press F to maximize the test area.
03
Check the pattern
For Greyscale, look for shades that merge. For Uniformity, check the center, edges, and corners.
04
Record what you see
Select the result that best matches the screen.
For best results, view straight on and check in normal room lighting. Uniformity is about whether a single color looks even across the screen, while greyscale is about distinguishing different shades.
Scope
About this test
Greyscale — shades
Greyscale shows patches from black to white. Check whether adjacent shades remain distinguishable. Full Range covers 0–255, Shadow Detail focuses near black (0–50), Highlight Detail near white (205–255).
Uniformity — evenness
Uniformity uses full-screen gray fields at 5%, 10%, 25%, 50%, 75%, and 100%. Look at the center, edges, and corners for darker or brighter areas, clouding, blotches, tint shifts, banding, or unevenness. 50% gray is commonly used for general checks; near-black fields can reveal issues in darker scenes.
What this test does not do
It does not measure panel bit depth, gamma, color accuracy, or calibration, and it does not diagnose the display automatically. It is a visual inspection only.
What can affect what you see
Brightness, gamma or picture settings, ambient light, viewing angle, browser color management, and panel characteristics can all change how gray levels and uniformity appear.
Tip
Use your normal brightness and picture mode, dim the room slightly, view straight on, and avoid leaving the same field on for long.
What is Greyscale & Uniformity Test?
Greyscale checks whether nearby shades of gray look distinct - for example, near black or near white. Uniformity shows a flat gray field at different levels (like 5% to 100%) so you can see if the screen looks even or has darker, brighter, cloudy, or tinted areas. You just look - no numbers are measured.
FAQ
Greyscale & Uniformity Test FAQ
01How do I test my monitor's grayscale?
Display the grayscale patterns and check whether you can distinguish nearby shades without them merging together.
02What should I look for in a grayscale test?
Look for dark or bright shades that disappear, merge together, or look noticeably different from nearby shades.
03What is a screen uniformity test?
It checks whether the same color or gray level looks reasonably consistent across different parts of the screen.
04How do I test my screen for uniformity?
Use the uniformity mode with a full-screen gray field and compare the center, edges, and corners.
05Why does my monitor look darker in the corners?
Brightness can vary across a display because of panel characteristics, viewing angle, backlight behavior, and display settings.
06What is the difference between grayscale and uniformity?
Grayscale checks whether different shades can be distinguished. Uniformity checks whether the same shade looks consistent across the screen.