Short answer
Calibration adjusts a display towards a chosen target — a white point, a brightness and a tone curve — and profiling then measures what the calibrated display actually does and records it in an ICC profile, so colour-managed software can convert content accurately. It is worth it when you judge or approve colour, when several people must see the same thing, or when a wide-gamut screen is showing everything oversaturated. It cannot add colours the panel cannot make or correct for an unsuitable room.
Calibration changes the display's behaviour: setting the monitor's own controls or loading correction curves into the graphics card so that white lands on the chosen white point, peak luminance reaches the chosen level and grey steps follow the chosen tone curve. Profiling characterises the result: a colorimeter or spectrophotometer measures a set of colour patches and software builds an ICC profile describing the display's primaries, white and response. Operating systems give that profile to colour-managed applications, which then convert content from its colour space into the display's. A calibrated but unprofiled screen can still show sRGB content oversaturated; a profiled but uncalibrated screen can be accurate but with a white point nobody chose.
For web, app and general design work, a D65 white and the sRGB tone response (or 2.2) match how content is authored. The sRGB definition assumes 80 cd/m², a reference level for its encoding conditions; in practice people set 100 to 160 cd/m² so the screen suits their room rather than dazzling or looking dim beside it. Video mastering for SDR follows BT.1886's 2.4 gamma at 100 cd/m². HDR work needs a display able to reach well above the 203 cd/m² reference white. Print proofing is different again: the target is often matched to paper white under the viewing booth. There is no single correct setting; the correct one matches the medium you are producing for and the light you work in.
Brightness is the setting most often wrong. A screen set far brighter than the room makes every print look dark by comparison.
A profile can only map colours into the gamut the panel physically has, so calibration does not turn an sRGB screen into a P3 one. It cannot fix non-uniformity across the panel (corners darker or tinted), which matters on large displays and needs a panel with uniformity compensation. It does nothing about glare, a coloured wall reflecting into the screen or mixed daylight and lamp light, all of which change what the eye sees. And a profile is only valid for the display mode, brightness and connection it was made in: switching the monitor to a 'vivid' preset or changing the brightness by a lot invalidates it.
Displays drift as backlights and emitters age, faster in the first months of use and faster for some OLED materials. Monthly or quarterly re-profiling is typical for colour-critical work; occasional checks are enough otherwise. A colorimeter is the usual instrument for displays and must have a correction suited to the panel's spectrum (white-LED, wide-gamut, quantum-dot, OLED), or it can mis-read the primaries. On Windows 11, a correctly made profile of the right type also enables automatic system colour management on SDR displays, extending the benefit to apps that are not themselves colour-aware.
| Purpose | White point | Tone curve | Luminance anchor |
|---|---|---|---|
| Web, UI and general design | D65 | sRGB curve (≈ 2.2) | sRGB reference 80 cd/m²; often set higher to suit the room |
| SDR video grading | D65 | BT.1886 (2.4) | 100 cd/m² SDR reference |
| HDR video grading | D65 | PQ or HLG | Reference white 203 cd/m²; display must exceed it by a wide margin |
| Print soft-proofing | Matched to paper under the booth (often near D50) | Per workflow | Matched to booth illuminance |
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactStrong evidence
ICC colour management relies on a profile that characterises each device, so that colour-managed software can convert content from its source colour space into that device's colour space.
Source: International Color Consortium: specifications and information
StandardStrong evidence
The sRGB proposal specifies a reference display luminance of 80 cd/m² and a dim reference environment of about 64 lux, lower than typical current office use.
Source: A Standard Default Color Space for the Internet – sRGB (version 1.10)
FactStrong evidence
On Windows 11 version 22H2 and later, SDR displays are eligible for automatic colour management only if provisioned with a valid profile by the manufacturer or a calibration provider.
Source: Use DirectX with Advanced Color on high/standard dynamic range displays
ConventionModerate evidence
Choosing brightness to suit the room, rather than a published reference level, is a working convention; the reference levels in sRGB and BT.1886 describe encoding conditions, not a required everyday setting.
Source: A Standard Default Color Space for the Internet – sRGB (version 1.10); Recommendation ITU-R BT.1886: Reference electro-optical transfer function for flat panel displays used in HDTV studio production
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.