Uniformity Test

Visually compare relative brightness and color consistency across neutral gray and solid-color patterns.

Go to test controls

This check opens a focused test surface. You can return with Escape. Review what this browser test can and cannot measure.

Before you start

  • Use steady room lighting and sit centered in front of the display.
  • Keep display brightness and color settings unchanged during the comparison.
Step-by-step instructions

How to run this check

  1. Use steady room lighting and view the screen from the center
  2. Start the Uniformity Test in fullscreen
  3. Cycle through brightness levels (0%, 5%, 10%, 25%, 50%, 100%)
  4. Enable the grid overlay to record the location of visible changes
  5. Note the pattern, location, and direction of any brightness or color variation

Test Patterns

Uniformity observations and limits

Observation Controlled recheck Limit
Dark or bright patch Repeat from the centered position at the same brightness. No luminance percentage
Color tint in one area Repeat on neutral gray and solid colors. No Delta E measurement
Change near an edge Compare centered and off-axis positions. Does not identify panel technology

Keep room light, display brightness, and the centered reference position fixed. Camera exposure can exaggerate or hide a visible difference.

Use the finding to choose your next check

No obvious patch or tint noted in the patterns I checked.
Return to your usual content. Keep this record as a baseline; there is no need to complete every gray level if the original concern is absent.
A dark or bright patch was visible.
Recheck the same location on 5%, 50%, and white at unchanged brightness. Then check whether it is distracting in the content you normally use.
A color tint was visible in one area.
Return to a centered viewing position and repeat on gray and white. Note whether the tint stays in the same screen location when your head moves slightly.
Both a brightness patch and a color tint were visible.
Record the two locations separately, repeat with the same gray level and viewing position, and compare the affected area with ordinary content.
Uniformity was not assessed / I am not sure.
Choose one neutral gray at comfortable brightness and compare the center with the edges. Save uncertainty if you cannot make a consistent observation.

What this browser test can tell you

Can help you check

  • Relative brightness and color consistency by visual inspection.

Cannot measure

  • This test cannot calculate a calibrated uniformity percentage or Delta E.

Interpret this observation

  • Record the pattern, location, and direction of any visible brightness or color shift.
  • Exact uniformity and Delta E measurements require a calibrated colorimeter or imaging colorimeter.
Setup and sources

Recommended setup

  1. Use steady room lighting and view the screen from the center.
  2. Compare several neutral gray and solid-color patterns at one brightness setting.

Sources

Methodology reviewed: