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Monitor Gamma Test
Match a gradient against reference patterns and estimate which gamma value your display is actually running.
Gamma describes how your monitor turns the numbers in a signal into actual brightness. The relationship is not linear: double a pixel's digital value and the emitted light does not double, it follows a curve. That exponent is gamma, and it decides whether the midtones of an image look solid and full-bodied or pale and weak. When the curve drifts from the expected value, photographs lose depth, game shadows flatten out, and gradients show steps where there should be a smooth transition.
This test uses band patterns and one neat visual trick: alternating white and black stripes average out, when viewed from a distance, to a brightness equivalent to a specific grey. Place a continuous grey patch or gradient beside them, and the point where the two become indistinguishable reveals which gamma value your screen is working at. It is a quick, free estimate and surprisingly effective at catching a setting that is plainly wrong.
How to Run the Test and What It Cannot Do
Go full screen and step back: at normal viewing distance, or even one pace further, the stripes blend and the comparison works far better. Squinting or letting your eyes defocus slightly also helps. Look for the patch where the striped area and the solid area appear equally bright; the number attached to it is your approximate gamma. Repeat the reading face-on with your head level, because on TN panels the vertical angle changes the result dramatically. Now the warnings, and they matter. A visual estimate is no substitute for a colorimeter: the human eye compares well but does not measure, and here you only get the nearest value on the scale, not a full point-by-point curve. Room brightness also shifts perception noticeably; under bright light the image looks washed out and you will tend to read a lower gamma than is really there. Run the test under stable, moderate lighting with no reflections on the panel, and do not touch the brightness control halfway through.
Gamma Values and What They Mean
These are the five reference values shown in the test, with the look each one gives an image and the scenario where using it makes sense.
| Gamma value | How the image looks | Recommended use |
|---|---|---|
| 1.8 | Clearly washed out: midtones lift, perceived contrast drops and shadows reveal more detail than they should. | A legacy of older prepress workflows. Today it only makes sense in very bright rooms or specific print-proofing cases. |
| 2.0 | Slightly pale. You gain extra detail in the dark areas, but the picture loses density and blacks look greyish. | Can help in very bright office environments, though it departs from the standard and skews photo editing. |
| 2.2 | The balance point: solid midtones, shadows that close without crushing, and smooth gradients. Most content was made this way. | The sRGB standard and the default choice for general use, web, office work, gaming and photo editing in normal light. |
| 2.4 | A denser, more contrasted image. Blacks gain depth and shadows close up, at the risk of losing fine detail. | The reference for film and video in a darkened room, where the eye tolerates and even rewards a steeper curve. |
| 2.6 | Very dark. Much of the shadow detail disappears and midtones sink, with abrupt steps in gradients. | Out of range for almost everything. Usually a sign of a badly chosen picture mode or a profile applied by mistake. |
Why Gamma Matters
Nearly all the content you consume was created assuming a gamma of 2.2. The sRGB space that governs the web, most photographs and a large share of games is defined around that value. If your monitor drifts away from it, you are not seeing what the author intended: a photo edited on a low-gamma panel will come out too dark on every other screen, and a game running high gamma will hide an enemy crouched in a shadow that was perfectly readable on the developer's display.
The second reason is that gamma is very easily confused with brightness, and adjusting one while believing you are adjusting the other leads to worse results. If the picture looks flat and you raise panel brightness, you lift the entire scale evenly, black included, and black stops being black. If the real problem is a skewed curve, the fix lives in the monitor's gamma setting or the system profile, not in the brightness control. This test exists precisely to tell you which of the two you are dealing with.
Finally, the right gamma depends on the environment. In a dark room the eye perceives more contrast, which is why the cinema reference is 2.4. In a sunlit office that same curve turns shadows into unreadable black blobs. Choosing a value is not a matter of faith but of where and how you look at the screen, which is why many monitors let you store several presets for different times of day.
Tips for a Reliable Reading
- Step back a couple of paces: the bands only blend properly once you can no longer resolve them.
- Look straight on with your head level; on TN panels a slight tilt changes the reading completely.
- Work under stable ambient light with no reflections, and leave brightness alone mid-comparison.
- Switch off any dynamic picture mode, blue-light filter or automatic contrast feature before you start.
- Check that no third-party ICC profile is loaded in the operating system before blaming the monitor.
- Repeat the reading at another time of day if your room changes a lot between morning and evening.
Frequently Asked Questions
Which gamma value should I use on my monitor?
In the overwhelming majority of cases, 2.2. It is the value tied to sRGB, the space in which web content, the photos you share and most games are created, and it works well in a normally lit room. Departing from it only makes sense under very specific conditions: 2.4 for watching film in a darkened room, where the eye tolerates a steeper curve, and lower values only in very bright environments or legacy workflows that demand them. When in doubt, stay at 2.2 and adjust brightness rather than gamma.
Why does my screen look washed out even at low brightness?
Because the problem is probably the curve rather than the brightness. A gamma below 2.2 lifts midtones and shadows, so the image loses density and black looks grey even though the panel is not emitting much light. Other factors can be involved too: a picture mode with shadow enhancement enabled, an incorrect colour profile in the operating system, or an RGB range badly negotiated over the cable. This test helps you rule out the first hypothesis before you start changing anything else.
Can I calibrate my monitor using this test alone?
No, and that is worth being clear about. This test gives a visual estimate of the approximate value your screen is running at, which is useful for catching a plainly wrong setting. A real calibration measures the panel's response point by point with a colorimeter, also corrects white point and the response of each colour channel, and produces a profile that the system applies. If your work depends on colour, a colorimeter is an unavoidable investment; for everyone else, keeping gamma at 2.2 and checking it with this test covers most of the need.
Why do I read a different value at different times of day?
Because your perception shifts with ambient light. Your eye adapts to the overall illumination of the room, and that adaptation changes how you interpret the screen's midtones. Under strong light the image looks washed out and you will read a lower gamma; in darkness the opposite happens. That is why you should always test under similar conditions and, if your room varies a lot, consider storing two different presets in the monitor for day and night.
Should I adjust gamma in the monitor or in the operating system?
Preferably in the monitor. Many models include a gamma setting in their menu, usually with options matching the values in this test, and that correction is applied at the panel without sacrificing signal levels. Operating system or graphics driver adjustments manipulate the signal before it is sent, and when the correction is large they can introduce visible banding in gradients. Start with the monitor menu and treat the system as a last resort or a way to fine-tune small residual errors.