Updated 6 November 2026

Grey screen

Choose a signal grey. 50% is RGB 128 (#808080). The percent is a share of 255, not the screen’s measured brightness.

50% grey · #808080

Percent grey is a share of 255, rounded. It is not the screen’s measured brightness.

Off by default. When it is on, the full-screen field walks through white, black, red, green, blue and grey, about 5 seconds each. It does not flash, and it does not fix pixels.

Visual inspection — this tool does not automatically detect defects.

Open this test as a page

Signal greys for uniformity. Percent means a share of 255, not measured brightness.

5% grey#0D0D0D10% grey#1A1A1A25% grey#40404050% grey#80808075% grey#BFBFBF90% grey#E6E6E6

Purpose

Grey is the practical field for clouding, tint and dirty-screen effect. Start at 50%, then try darker steps if the shadows look uneven. The values are listed on the uniformity page and under each swatch.

Values

LabelRGBHex
5% grey13, 13, 13#0D0D0D
10% grey26, 26, 26#1A1A1A
25% grey64, 64, 64#404040
50% grey128, 128, 128#808080
75% grey191, 191, 191#BFBFBF
90% grey230, 230, 230#E6E6E6

What to look for

Clouds, corner shade, bands and a tint. If the patch moves when you change angle, note that. Sit centred before you call it a fixed stain.

Limitations

Percent is not nits. Gamma and your brightness slider change the picture. This page does not read either one.

Questions

Which grey should I use?

Start with 50% grey, RGB 128 (#808080). Then try 25%, 10% and 5% if you are looking for clouding in the shadows.

Does 50% mean half brightness?

No. It means half of the 8-bit code range, rounded. The panel’s brightness setting, gamma and tone curve change how light that code looks.

The patch moves when I tilt my head. What then?

It could be viewing angle or coating, which is common on IPS panels. Note that it moves. A fixed stain tends to stay when you sit centred.

Can I judge this from a photo?

A camera changes exposure and invents texture. Look with your eyes. If you need a record, photograph the panel from outside the browser and say that in your notes.