Contrast Test

Good contrast means you can tell neighboring shades apart, from the darkest grays to the brightest. These patterns make that easy to judge.

All 16 steps should look distinct, from black on the left to white on the right.

Runs entirely in your browser. Nothing is uploaded or stored.

How to use

  1. Use the display settings you normally use. Dimming the room helps with the dark patterns.
  2. Press Start test and move through the patterns.
  3. On the grayscale ramp, count how many distinct steps you can see. All 16 should be visible.
  4. On the near-black and near-white patterns, find the first step you can distinguish from the background.

What this test can detect

  • Black crush: the first few near-black steps are invisible.
  • White clipping: the last few near-white steps blend together.
  • Gamma or contrast settings that are too high or too low.
  • Uneven contrast between the center and the edges of the checkerboard.

Important

  • Your browser shows 8-bit values, so the smallest step is 1/255. Very small differences are hard to see on any display.
  • Ambient light and screen reflections reduce the contrast you can perceive.
  • If a few steps are hard to see, adjust brightness, contrast, or gamma in your display settings before assuming the panel is faulty.