Gamma Test

Compare browser-rendered blending patterns and record the closest-looking labeled patch as a visual reference.

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, native resolution, and 100% browser zoom.
  • Keep color management and display settings unchanged throughout the comparison.

How to run this check

  1. Start the Gamma Test
  2. Choose a test pattern (Vertical Bars, Horizontal Bars, Grid, Blocks, Checkerboard)
  3. Select a color channel (White, Red, Green, Blue)
  4. Record the labeled patch that appears to blend most closely
  5. Treat the result as a browser pattern comparison, not calibrated display gamma

What this browser test can tell you

Can help you check

  • Visual blending comparison against browser patterns.

Cannot measure

  • This test cannot determine calibrated display gamma without measurement hardware.
Setup, interpretation, and sources

Recommended setup

  1. Use the display native resolution and view the pattern at 100% browser zoom.
  2. Sit directly in front of the display under steady room lighting.

How to interpret what you see

  • Record the labeled patch that blends most closely from your normal viewing position.
  • Exact gamma measurement requires a calibrated colorimeter or spectroradiometer and profiling software.

Sources

Methodology reviewed:

Click to start fullscreen gamma testing. Use arrow keys to navigate patterns.

📊 Illustrative Tone References

Sample Labeled Gamma 2.2

A browser-rendered comparison sample, not a measured curve

Lighter-Looking Samples (1.8–2.0 Labels)

Illustrates a lighter relative appearance in this pattern

Darker-Looking Samples (2.4–2.6 Labels)

Illustrates a darker relative appearance in this pattern

How to interpret a closest-blend observation

Closest-looking reference

  • • Find blocks that "disappear" into background
  • • Record the closest-looking label as a visual observation
  • • The label is not an instrument reading of the display

Channel comparisons

  • • White (grayscale) most important
  • • Compare the channels under the same conditions
  • • Record visible tints without assigning a hardware cause

Other visible differences

  • • Banding can come from several rendering and display stages
  • • Tinted grays are relative visual observations
  • • Differences between colors require measurement to quantify

Note: A workflow may specify a target tone curve. Confirm that target and measure it with calibrated equipment when accuracy matters.