REVIEW: Lenovo L2440p Part 8

Measurements and calibration

In this section, the quality of the colour display and the actual coverage of various colour spaces will be examined. The results are mainly of interest for graphics and photo editing, since the subjective impression is more important for office use and games.

Lenovo is also keeping a low profile when it comes to revealing the technical data. The measurements are also very clear here and round off the picture of the business monitor, which does not nourish any promises of being a professional graphics model.

sRGB is the lowest common denominator for the interaction between various input and output devices in the consumer sector. In addition, Windows assumes sRGB if no colour profile is present for a device or graphics file.

Many colour printers work on normal paper with the sRGB profile. This is also why the sRGB colour space is significant for "normal users" unlike the ISO Coated printing colour space. Because of the spread of digital cameras and the increase in amateur photography, photo services have also changed many of their exposure machines to the sRGB colour space in order to spare their customers having to work with special colour spaces.

The comparison of the monitor’s colour space with the ISO Coated colour space used in offset printing is also interesting, since this generally represents the least that modern inkjet printers can manage. Many modern inkjet printers can also cover even larger ranges.

3D colour space comparison

Next, the relevant 3D colour space comparisons are displayed for the monitor. Special attention should be paid to the sRGB colour space, since this is standard for the Internet, printers and amateur film and photo editing.

Explanation: In the 3D views, the black grid represents the respective standard colour space and the white grid represents the monitor’s colour space. The coloured cube represents the actual intersection between both colour spaces. The respective standard colour space is larger than that which the LCD can actually display where the black grid protrudes beyond the coloured cube. On the other hand, if the white grid protrudes beyond the cube, the monitor colour space is larger at this point than the respective standard colour space.

ISO Coated: 91 % coverage

The monitor’s colour space is not sufficient to cover the ISO Coated colour space completely.

sRGB: 96 % coverage

The colour space of the monitor is very similar to the sRGB colour space, but is not sufficient to cover it completely. Further colour space comparisons with larger colour spaces (AdobeRGB 73 % coverage) will therefore certainly not provide any higher coverage. Thus, it is clear that the ideal colour space coverage is reached for sRGB.

deltaE deviation

Explanation of deltaE deviation: Deviation in colour values is measured in deltaE 94 (dE). Several grey gradients, the primary (RGB) and the secondary (CMY) basic colours are measured. A deltaE value of 1 represents the smallest difference in colour that the human eye can perceive.

Most people notice a difference in colour from a value of 3. However, our eyes are more sensitive to green tones, so we notice smaller differences here. The average deviation should be under 3 dE and the maximum should be under 10 dE, or, better still, under 6 dE. Up to 10 dE, two colours are still sufficiently similar.

Comparison of factory setting "Reddish" with sRGB standard

Factory setting	sRGB standard	Measured
White point / Kelvin	6500	6712
Brightness / cd/m²	140	266
Black point / cd/m²	0,00	0,32
Contrast / x:1	Native	830
Gamma / average	sRGB (~2,2)	2,31

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