How to Calibrate a Monitor
You can improve a screen a great deal with your eyes and a few patterns. You cannot calibrate one that way, and this guide is clear about where the line is.
By eye you can set brightness for the room, check that shadow and highlight steps are visible, judge gamma against a line pattern, look for banding, and confirm the screen is running at its native resolution. What you cannot do by eye is calibration in the proper sense: EIZO describes that as adjusting a monitor to a target with a sensor, either through the monitor's own controls in software calibration or by controlling the monitor directly in hardware calibration. A browser has no sensor, so this page adjusts and checks — it does not calibrate.
There are two honest versions of this topic. One is “calibrate your monitor”, which needs a sensor. The other is “stop your monitor being obviously wrong”, which needs twenty minutes, your eyes and a few patterns. This guide is the second, and it says so plainly rather than borrowing the word from the first.
What calibration actually means
EIZO, which makes displays for people who care about this, splits it in two. Software calibration “is conducted using a general-purpose calibration kit and the monitor’s standard color-adjustment function”, with the user adjusting the monitor’s color themselves by following the kit’s program. Hardware calibration is “conducted by controlling a monitor directly via a calibration function”, using specialized software and sensors.
Both involve a sensor. The sensor is the point: it measures what the screen is actually emitting and compares it with a target. Your eyes cannot do that, because they adapt — to the room, to the last thing you looked at, to the screen itself within about a minute of staring at it.
A browser has no sensor. What it has is patterns that make a fault obvious, which is a different and still useful thing.
Before you touch a control
- 1
Settle the room. Work in the light you normally use, with no window reflecting off the panel. Changing the room after adjusting means starting again.
- 2
Let the screen warm up. EIZO recommends about 30 minutes before testing a monitor, for exactly the same reason it matters here.
- 3
Set the native resolution and 100% browser zoom, so patterns land on real pixels.
- 4
Find the picture mode. Modes named for movies, games or "vivid" apply processing you are about to spend twenty minutes fighting. Start from the plainest, most neutral mode your menu offers.
What the controls in the menu actually do
Half the confusion in this job comes from three controls that sound similar and are not.
| Control | What it changes | What it cannot do |
|---|---|---|
| Brightness (backlight) | How much light the panel puts out overall, which is the one to set for your room | Change how the picture is divided into light and dark; on an LCD it does not deepen black in absolute terms |
| Contrast | How far apart the light and dark ends are pushed | Add detail; set too high it clips the brightest steps away entirely, which the contrast test shows |
| Gamma or picture mode | The shape of the curve between black and white | Fix a mismatch caused by the wrong signal range, which lives in the graphics settings, not the monitor |
A fourth control deserves naming: anything called dynamic contrast, eco mode or adaptive brightness changes the picture while you are looking at it. Turn those off before judging anything, or you will be measuring the feature rather than the panel.
The order that works
1. Brightness, for the room you are in
Most screens leave the factory far brighter than a normal room needs, because bright sells in a shop. Set it so a white page is comfortable to read for a long stretch. That is a comfort judgment rather than a measurement, and no figure is offered here, because the right level depends on the light around you.
2. Shadows and highlights
Open the Screen Contrast Test. Near-black steps should be distinguishable from black, and near-white steps from white. If the darkest few steps all look identically black, something is crushing shadows: usually a contrast control set too high, a “dynamic contrast” feature, or a black-level setting that expects a different signal range.
3. Gamma
The Gamma Test puts a one-pixel line pattern beside solid grays. Step back or squint until the lines blur, and find the column whose halves match. Most computer content assumes about 2.2. This is an estimate by eye and the page says so: scaling, sharpening and dithering all shift it.
4. Color
The Color Accuracy Test shows standard patches. The honest use is comparison, not judgment: a screen cannot check itself, so compare against a second display you trust, or a print you know. What you are looking for is an obvious cast, not a precise match.
5. Gradients and fine detail
The Color Banding Test shows whether smooth ramps break into steps, which usually points at a picture mode or a limited signal range rather than the panel. The Sharpness Test catches oversharpening halos and scaling blur — the two things that make text tiring without ever looking obviously wrong.
6. A last look at the whole field
The Screen Uniformity Test at three gray levels shows brightness falloff and tint drift across the panel. Nothing in your menu fixes that, but it is worth knowing about before you spend an evening chasing a “color problem” that is really a corner of the screen being dimmer than the middle.
Write down the settings you end up with. Picture modes reset, firmware updates happen, and a photograph of the menu takes five seconds.
Where this stops
This is the part most guides skip. After all of the above you have a screen that is set up sensibly for your room. You do not have:
- A measured white point. No sensor, no figure.
- A profile. Color-managed software needs a description of your display’s behavior, and that is produced by measurement, not by adjustment.
- Consistency between two screens. Matching two displays by eye gets you close and no further, because your eyes adapt between looking at one and the other.
- Repeatability. Do this twice a month apart and you will land somewhere slightly different, which is exactly what a sensor exists to prevent.
If any of those matter — print work, video that has to match, two screens side by side — the answer is a colorimeter and the software that comes with it, and EIZO’s distinction tells you what you are buying: a kit that guides your own adjustments, or hardware calibration that controls the monitor directly.
For everyone else, the checks above are most of the benefit for none of the cost, and they take about as long as reading this page.
Questions
Can a web page calibrate my monitor?
No, and this one does not claim to. Calibration compares what a screen actually emits against a target, which needs a measuring device. A web page can only show you a pattern and let you judge it.
What is the difference between software and hardware calibration?
EIZO's definitions: software calibration "is conducted using a general-purpose calibration kit and the monitor's standard color-adjustment function", with the user adjusting color themselves following the kit's program; hardware calibration is "conducted by controlling a monitor directly via a calibration function", using specialized software and sensors.
Is adjusting by eye worth doing at all?
Yes, for most people it is the difference between a screen that is obviously wrong and one that is fine for everyday work. It sets brightness sensibly, catches a picture mode that is crushing shadows, and finds scaling and sharpening faults. It just is not a measured result.
Which order should I do things in?
Room light first, then brightness, then contrast steps, then gamma, then color, then the fine-detail checks. Later steps depend on earlier ones, so working backwards means doing it twice.
My screen has a factory calibration report. Does that settle it?
It describes the panel as it left the factory, in the mode it was measured in. It says nothing about your room, your settings or how the panel has aged, which is exactly what these checks look at.
How this guide was made
The definitions of calibration and of software and hardware calibration are quoted from EIZO's own library, with the date it was read. Everything else describes what ScreenTail's own patterns do, from the tools as they are built, including the limits each one states.
No target numbers for brightness, white point or gamma. Those depend on your room and your work, and a figure quoted without a measuring device to check it against would be theater. No colorimeter model recommendations and no prices either: the roadmap records that Wave 2 carries none.
- 01The definitions of software calibration (a general-purpose kit and the monitor's own color-adjustment function, adjusted by the user) and hardware calibration (specialized software and sensors controlling the monitor directly): EIZO, Software Calibration & Hardware Calibration — retrieved Sep 23, 2026.
- 02Warming the monitor up for about 30 minutes before testing, and cleaning the display first: EIZO, Monitor Test — retrieved Sep 23, 2026.