📝 Check Monitor Colours Before Changing Display Settings

When screen colours look wrong, the first instinct is to start moving the brightness and contrast sliders. That usually makes things worse: as the settings drift, the reference point disappears and you end up somewhere you cannot get back from. The correct order is to establish what you are seeing first, then adjust.

Reset to factory settings first

Every monitor menu has a reset option. If you have already been adjusting things, start there. Any change made without a known starting point is guesswork.

Check the picture mode too. Presets named “Vivid”, “Game” or “Cinema” exaggerate colour deliberately. If you want accuracy, “Standard” or “sRGB” is the right place to begin.

Look at three things separately

Colour complaints generally come from one of three distinct problems, and each is checked differently.

Colour channels. Confirm the red, green and blue elements are behaving with the RGB colour test. A channel that looks weak or dirty can indicate a cable or a panel issue.

Contrast. Check whether dark tones separate from each other with the contrast test. If you lose detail in dark scenes, this is where it shows up.

Gradient smoothness. If you see stepped bands instead of a smooth transition, the gradient banding test reveals it. Banding usually relates to the panel’s colour depth or to a heavily compressed source file.

Physical checks before settings

• The cable. A loose or poor quality cable causes colour shifts and pink or green casts. Reseat both ends and try a different cable if you can.
• Room lighting. Under a warm bulb a screen looks blue. Judge colour in daylight or neutral light.
• Viewing angle. Some panels wash out off-axis. Judge from straight on.
• Screen filters. Blue light reduction shifts everything yellow; turn it off while checking.

If you run two monitors

Two screens never match exactly, and across different makes the gap can be wide. Trying to force one to match the other commonly ends with both set badly. Get each screen right on its own terms first, then accept a reasonable similarity.

Frequently asked questions

Do these tests measure colour accuracy?
No. True colour measurement needs a hardware calibration device. Browser tests reveal the faults a person can see — channel problems, banding and lost contrast.

Colours are only wrong in one program.
Then it is not the screen. Look at that program’s own colour settings or the graphics driver’s per-application profile.

My screen has yellowed over time.
Backlights age and colour temperature drifts. Adjusting colour temperature in the monitor menu compensates partly.