PC Monitor Gamma: What It Is and What to Set It To

Gamma is the curve that decides how bright each signal level looks on screen, and on a PC monitor you want it set to 2.2. That value matches the sRGB standard, which is what Windows, the web, and almost every game and photo are built around. Get it wrong and shadows either turn to mud or wash out into grey, no matter how good the panel is. Here is what the number means, how to check yours, and where to change it.

What gamma actually controls

Gamma describes the relationship between the signal your PC sends and the light your monitor gives back. It follows a simple power curve, y = x to the power of gamma, where x is the input level and y is the light that comes out.

At a gamma of 2.2, a signal sitting halfway between black and white does not come out at half brightness. It comes out at about 22 percent. That sounds wrong until you remember that human vision is not linear either. We are far more sensitive to changes in dark tones than bright ones, so the curve spends most of its precision down where your eyes are looking.

The reason this curve exists goes back to old tube televisions, which brightened unevenly by their nature. Every image and video since then has been made assuming a screen behaves that way, so today’s flat panels copy the same curve to stay compatible.

Gamma is not the same thing as brightness. Brightness sets the overall light output, usually by driving the backlight. Gamma decides how the levels between black and white are spread out inside that range. Turning brightness up on a screen with low gamma makes it lighter and just as flat.

The visible result splits neatly in two:

• Gamma too low. Midtones lift, shadows go grey, and everything looks flat and slightly foggy. Dark scenes lose their punch.
• Gamma too high. Midtones drop, contrast looks strong at first glance, and detail disappears in the shadows. Dark game corners turn into solid black.

A quick example makes it concrete. Picture a night scene in a game, a dark room with a figure standing in the corner. At the right gamma you can just make out the figure against the shadows. Push gamma too high and that corner goes pure black, so the figure disappears entirely. Drop gamma too low and the whole scene turns grey and hazy, the shadows lose their weight, and the moody lighting the artists built falls apart. The number itself is invisible, but its effect on what you can and cannot see is not.

What to set PC monitor gamma to

Use 2.2 unless you have a specific reason not to. It is the value Windows assumes, the value built into sRGB, and the value nearly every LCD and OLED panel is designed around.

The 1.8 figure is a leftover from print. Mac OS used it as the default until Snow Leopard moved to 2.2 in 2009, and it now only makes sense when you are looking at something authored for it.

The case for 2.4 is real but narrow. It comes from broadcast and cinema standards, which assume a dim viewing room. In a lit office it looks heavy and buries shadow detail. Room lighting genuinely changes what reads as correct, so a screen calibrated to 2.2 in a dark room can feel a little dark at midday next to a window.

The choice comes down to the light around you, not personal taste. In a dark room your pupils open wide and you become very sensitive to shadow detail, so a darker curve looks rich and correct. Add some light to the room and things flip. Ambient light bounces off the screen and lifts the blacks, so the same 2.4 setting now buries shadow detail and the picture reads as muddy. Lowering the curve to 2.2 brightens the shadows just enough to cancel out the room’s glare, and the image ends up looking the way it should.

Some menus go further and offer 2.6. Higher numbers like 2.6 tie to digital cinema projection and look very dark and saturated on a normal desk. At the other end, lower numbers such as 1.8 or 2.0 lift the shadows and can help if you use the screen in bright sunlight and just need to see the picture, at the cost of a flatter, paler look. None of these is a general-purpose choice; they exist for particular rooms and particular content, and 2.2 remains the one to default to.

What gamma should my monitor be?

For nearly every everyday use, the answer stays 2.2. Here is how that plays out across the things people actually do on a monitor.

Gaming

Set your monitor to 2.2 and adjust from there inside the game. Games are made and tested on 2.2 screens, so that gives you the picture the developers intended, with a fair balance of dark-scene visibility and shadow detail. The in-game slider is a separate control, covered in what gamma means in games below.

Photo editing

Photographers should be on 2.2, no exceptions. Standard image files assume it, so if your screen is off you will “fix” a photo to look right on your monitor and then publish something that looks wrong to everyone else. If you edit seriously, a hardware calibration tool (a small sensor that sits on the screen) will lock your display far more precisely than eyeballing it ever can.

Movies and video

Use 2.2 for casual watching, and switch to 2.4 only in a dark room for a more cinematic look. Streaming and disc content is generally graded on 2.4 in a dark mastering suite, which is exactly why 2.4 pays off when your own room matches those conditions and falls apart when it does not.

Office work and text

Stay near 2.2 and set your brightness to suit the room. That combination keeps text readable, whites under control, and the grey panels in menus cleanly separated. A quick way to catch a bad setup on a two-screen desk: drag a plain grey window from one monitor to the other. If one looks noticeably smokier or denser than the other, their gamma does not match.

Mac vs Windows

If you have read that Macs should use gamma 1.8, ignore it. The old 1.8 value dated back to the early days of Mac computers and black-and-white laser printing, long before the web ran on the sRGB standard. Sticking with it today makes photos and web pages look pale and washed out compared to how the rest of the world sees them. Whether you are on a Mac or a Windows PC, 2.2 is the number, and a modern Mac already uses it out of the box.

What gamma means in games

The gamma or brightness slider in a game’s settings is not the same control as the gamma setting on your monitor. The game applies its own curve to the image before it leaves the graphics card, so the slider sits on top of whatever the monitor is already doing. Set the monitor to 2.2 first, then use the in-game slider to line the game up with your screen and your room.

Most games show a calibration screen for this: a logo or symbol on a dark background, with an instruction to adjust until it is barely visible. Move the slider until the logo disappears, then bring it back a step or two so it is faint but still there. If the screen shows two or three images, the darkest one should vanish while the next stays just visible. Do this in the lighting you normally play in, since a setting that looks right at night will look too dark at midday.

Competitive players sometimes raise brightness to spot enemies hiding in shadows, but treat that as a tactical tweak, not an accurate picture. Pushing the slider up lifts every dark tone together, so blacks turn grey, contrast drops and the whole scene looks flat. It also only affects that one game. Lowering the monitor’s gamma has a similar look but changes everything on screen, the desktop included. If you want to see into dark corners without washing out the rest, a black equaliser setting in the monitor menu does it more selectively.

HDR games work differently. Many replace the gamma slider with paper white and peak brightness settings. Paper white sets how bright menus and ordinary scene content look, and peak brightness should match what your monitor can actually reach, which the Windows HDR Calibration app helps you find.

How to check your gamma in two minutes

You do not need a colorimeter to spot a problem. A gamma test image shows striped patterns next to solid grey blocks, labelled with gamma values. Sit back from the screen or squint, and read off the point where the stripes and the block blend together.

Two rules make the test valid. Run the image at your monitor’s native resolution with no scaling in the browser or image viewer, and turn off any dynamic contrast or picture enhancement mode in the monitor menu first. Both will skew the result.

Two habits make the reading more reliable. Let the monitor warm up for 20 to 30 minutes first, since panels shift slightly when cold. Look at the screen straight on, not from an angle, because many panels change gamma noticeably as your viewing angle changes.

The Lagom gamma calibration test checks three separate brightness levels rather than one, which matters because monitors rarely behave the same across the whole range. On a true sRGB display the bands blend at 2.25 at 48 percent brightness, 2.20 at 25 percent, and 2.17 at 10 percent. Reading around 2.2 at the top level and drifting a little at the others is normal and fine.

Where to change it

Work through these in order, because each step after the first costs you something.

1. The monitor menu

   Look under Picture, Image or Colour for a Gamma entry. Some monitors name the options directly (1.8, 2.0, 2.2, 2.4) and others use Gamma 1, Gamma 2, Gamma 3, or Mode 1 and Mode 2. If it only shows labels, set each one in turn and use the test above to see which lands on 2.2. This is the best place to change it, because the monitor does the work in its own high precision internal table and nothing is lost on the way.
2. Windows Display Colour Calibration

   Search the Start menu for “Calibrate display colour”, or run dccw. The wizard walks you through a gamma slider with a target image. It is quick and free, and it is done by eye, so treat it as a rough correction rather than a calibration.
3. A colorimeter

   A hardware probe with software such as DisplayCAL or the tool bundled with the device measures the actual curve and builds an ICC profile with a correction table. This is the only option that gives you a number rather than an impression.

Avoid pulling gamma around in the graphics driver if the monitor can do the job. Driver-side correction reshapes an 8-bit signal, which throws away levels and can leave visible banding in gradients. The monitor’s own gamma control does not have that problem.

On a Mac, the built-in Display Calibrator is reached from System Settings, then Displays, through the colour profile menu. It works on the graphics side in the same way as the Windows wizard, so it is a fallback rather than a first choice.

Whichever route you take, change the setting in the lighting you normally use. Correct gamma can look too dark in a bright room or too bright in a dark one, so calibrating in your real conditions gives you a result that actually looks right where you sit.

Why your gamma never sits exactly on 2.2

Panels do not have a clean power curve to begin with. The native response of an LCD tends to wander, often in an S shape, and the red, green and blue channels can drift apart from each other, which shows up as tone jumps and slight colour casts in dark and bright areas. Better monitors fix this internally with a 10-bit, 12-bit or even 14-bit look-up table, remapping the incoming 8-bit signal onto a smoother curve. EIZO’s write-up on monitor gamma covers how that internal correction works.

Panel type matters too. On VA and TN screens, gamma shifts as your head moves, so the same image reads differently at the edges of a large screen than it does in the centre. IPS and OLED hold much steadier.

Is my monitor sRGB or 2.2?

There is also a wrinkle in the standard itself. The sRGB specification is not a plain 2.2 power curve. It uses a short straight section near black and an exponent of 2.4 above that, which averages out close to 2.2 but is not identical to it. That is why a monitor’s sRGB preset can measure slightly off 2.2 and still be correct.

In practice the two curves are nearly identical. From the dark midtones up to white they track each other so closely that photos, the desktop and most games look the same on either. The difference sits in the first few percent above black, where the sRGB curve’s straight section lifts the darkest steps noticeably higher than a pure 2.2 curve does. So near-black detail looks a little more open and greyer on sRGB, and a little deeper on pure 2.2. You see it most in dark game scenes and on OLED panels, where black is truly black.

To tell which one your monitor follows, check the menu and the manual. An sRGB picture mode usually targets the sRGB curve and also limits the colour range, while a gamma control set to 2.2 in a standard or gaming mode usually targets a plain power curve. Reviews that measure the panel will say which curve it actually tracks. Both are valid for a PC. If dark scenes look lifted and grey, a pure 2.2 setting is the better match; if shadow detail looks crushed, sRGB is the gentler one.

Gamma and HDR

The gamma setting applies to standard dynamic range content only. HDR10 uses a different transfer function called PQ, standardised as SMPTE ST 2084, which maps each signal level to an absolute brightness in nits rather than a share of whatever the display can manage. Because those values are fixed, there is nothing for a gamma control to adjust, and most monitors grey the setting out once HDR is running.

There is one practical wrinkle worth knowing on Windows. When you enable HDR, older standard-range content like the desktop, many games, and web pages can look faded, with greys where deep blacks should be. This happens because Windows uses a slightly different tone curve for that content than the gamma 2.2 curve those apps were built for: it is the sRGB curve described above, with its lifted near-black steps. Leave HDR off for everyday desktop use so your 2.2 gamma applies, and turn it on only for real HDR movies and games, where the screen handles the brightness curve for you. Microsoft documents the washed-out-HDR behaviour and the fix on its own Windows HDR support thread.

So set gamma for your SDR desktop and games, and handle HDR separately with the Windows HDR Calibration app or your monitor’s own HDR modes.

Conclusion

Set your monitor to gamma 2.2, check it with a test image at native resolution, and change it in the monitor menu rather than the graphics driver. If shadows look flat, gamma is low; if dark detail vanishes, it is high. In games, leave the monitor on 2.2 and use the in-game calibration screen for the rest. That single setting does more for how a screen looks than most of the other picture controls put together, and it takes a couple of minutes to get right.

For more, see our monitor specs guides.